FP64

ACE9040 provides all the speech signal processing and

data/SAT tone filtering needed for AMPS or TACS analog
cellular telephones.

Transmit voice channel functions comprise a microphone

amplifier, soft limiter, bandpass filter, compressor, hard
limiter, lowpass filter and a gain controlled amplifier to set
deviation level. Additional transmit circuits include a DTMF
generator, data and SAT filters, deviation setting amplifiers for
data/ST and SAT and a modulation combiner.

ACE9040's receive path comprises a bandpass filter,

expander, volume control and power amplifiers to directly
drive an earpiece or handsfree transducer.

Gain settings, mute switches and filter characteristics are

programmed via a three wire serial interface.

To implement a handsfree function, both transmit and

receive paths have rectifiers for signal amplitude monitoring
via an external pin and signal path attenuators controlled via
the serial interface.

ACE9040 combines minimum power consumption with

low external component count. Standby modes greatly reduce
supply current and extend battery charge intervals.

Features

Low Power and Low Voltage (3·6 to 5·0 V) Operation

Power Down Modes

Direct Connections to Microphone and Earpiece

Compander with wide operating range:

Compressor 74 db typ., Expander 36 dB typ.

SAT Bandpass and Data Lowpass Filters

Handsfree Operation Supported

DTMF Generator

Serial Bus Controlled Gains and Filter Responses

Part of the ACE Integrated Cellular Phone Chipset

TQFP 64 Pin 10X10 mm or 7X7 mm Packages

Applications

AMPS and TACS Cellular Telephones

Two-Way Radio Systems

Related Products

ACE9040 is part of the following chipset:
·

ACE9020 Receiver and Transmitter Interface

ACE9030 Radio Interface and Twin Synthesiser

ACE9050 System Controller and Data Modem

Absolute Maximum Ratings

Supply voltage 6 V
Storage temperature - 55

°C to + 150 °C

Operating temperature - 40

°C to + 85 °C

Voltage at any pin - 0.3 V to V

+ 0.3 V

ACE9040

Audio Processor

Advance Information

DS4289

ISSUE 4.1

January 2001

Ordering Information

Industrial temperature range

ACE9040J/IW/FP1N

64 lead (10x10mm) LQFP

rays

. Bake

and dry pack

ACE9040J/IW/FP1Q

64 lead (10x10mm) LQFP

Tape and Reel. Bake and dry pack

ACE9040J/IW/FP2N

64 lead (7x7mm) LQFP

rays

. Bake

and dry pack

ACE9040J/IW/FP2Q

64 lead (7x7mm) LQFP

Tape and reel. Bake

and dry pack

AMP

MODULATION

SUMMING

AMPLIFIER

DTMF

DATI

TSI

RSI

COMPRESSOR

DATA FILTER

(LOW PASS)

GENERATE/

TRANSPOND

FILTERS AND

DEVIATION SET

DTMF

GEN.

TX SAT
FILTER

RX SAT

FILTER

SET

LEVELS

CONTROL

LOGIC

EXPANDER

RXI

SCLK

LEN

STBY

SET DEVIATION

VOLUME

LINE OUTPUT

EPON

EPOP

RSO

TSO

DATO

MOD

SUMO

SUMI

TLPO

FEED-
BACK

Figure 2 - ACE9040 Simplified Block Diagram

Figure 1 - Pin connections - top view

Note: Pin 1 is identified by moulded spot and
by coding orientation. (* 7 x 7 mm package and
10 x10 mm package pinouts on page 3)

FP64

nc\DVSS*

AMPI

nc\LEN*

PREIN

DVSS\DVDD*

TBPO

LEN\VMIDRX*

CIN

DVDD\LO*

CRCIN

VMIDRX\STBY*

VMIDTX

LO\EVDD*

CRCOUT

STBY\EPON*

EVDD\nc*

COUT

EPON\nc*

TXC

EVSS

RXC

EPOP

IPS

EAMPFB

SLO

EAMPO

EIN

MICBIAS

ERCOUT

VDD

AMPO

DEC

DTMF

V485

RREF

BGAP

BIAS

TLPO

VDD

SUMI

SUMO

TSI

MOD

RSI

VSS

RXI

RBPO

TSO

EAMPI

RSO

HFGIN

EOUT

SCLK

ERCIN

ACE9040

ACE9040

Advance Information

Figure 3 - ACE9040 Detailed Block Diagram

180K

10nF

3.3

RXI

LOW P

ASS

FIL

TER

ONEM

VMIDRX

VMIDTX

BIAS

GENERAT

DEC

BIAS

RREF

MICBIAS

BGAP

100/

68*k

10nF

*VDD = 3.75V

RSI

RXSA

FIL

TER

TSI

-12 dB / 0 dB

DTMF

VDO

220 k

Vth

VDD

MLI

SLO

IPS

10nF

SOFT

LIMITER

INPSENSE

DTMFM

92% DETECT

LEVEL

DTMF

MODE

PRE-

EMPHASIS

TXSA

FIL

TER

-15dB

10dB

ADEV

RXBPF

RXM

EXPGAIN

VMIDRX

33nF

RBPO

EIN

ERCOUT

ERCIN

EOUT

HFGIN

EXP

ANDER

100nF

82nF

10nF

COMP[2:1]

SCHMITT

TDEV

VMIDRX

3 & 97%

DETECT

LEVELS

TEST

[1:0]

TXBPF

HFGAIN

10nF

180k

100nF

COMPRESSOR

TBPO

CIN

CRCOUT

CRCIN

COUT

PREIN

A
VSS

DVSS

V485

EVSS

33nF

82nF

GAIN

CONTROL

TEST

[2:1]

TEST

[1:0]

PRE-

EMPHASIS

HANDSFREE

RECTIFIER

RXC

HFS

TXC

HANDSFREE

RECTIFIER

RXLEVEL

TTEN

SIDET

ONE

LODRIVE

EARSENSE

EAMPI

EAMPFB

EAMPO

EAMP

VMIDRX

SUB

VDD

EVDD

A
VDD

DVDD

EPH0/

EPH1

EPH0/EPH1

HIZ

EPOP

EPON

VMIDTX

TXSENSE

VMIDTX

HARD

LIMIT

-8 dB

TEST[0]

TXLPF

TXM

VMIDTX

AUDIODEV

TLPO

DRIVER

TLPO

SERIAL

INTERF

ACE

STBY

LEN

SCLK

TXC 68nF

SUMI

MOD

TSO

SUMO

RSO

RXC

AMPI

AMPO

68nF

150

MIS

Advance Information

ACE9040

Pin No.

Name

Description

FP2 package FP1 package

supply to substrate, pin should be at highest d.c. voltage

DEC

Mid-supply reference decoupling connection, 3.3

µF to GND

Output from TX or RX handsfree rectifier, switched by bit "HFS"

Line input

RREF

Reference bias current set for all op-amps by resistor to GND

BIAS

Buffered mid-supply reference output

Analogue V

input

DATI

Transmit data input

TSI

SAT path input for locally generated tone

RSI

SAT path receiver input for received tone

RXI

Speech path receiver input

RBPO

Audio output from EXPGAIN block

EAMPI

Output from EARSENSE amp

HFGIN

Input to RX volume control and handsfree attenuator

EOUT

Expander speech output

ERCIN

Expander time constant input, 180 k

to ERCOUT, 100 nF to GND

ERCOUT

Expander time constant output, 180 k

to ERCIN

EIN

Expander speech input, 33 nF to RBPO

EAMPO

Output from EAMP op-amp

EAMPFB

Inverting input to EAMP op-amp

EPOP

Earpiece driver positive output

Earpiece V

(GND) supply connection

23/24

No connection

EPON

Earpiece driver negative output

Earpiece V

supply input

STBY

Standby output: low indicates standby state, high is V

output @ 10 mA

Line output

VMIDRX

RX path mid-supply reference voltage, 82 nF to GND

Digital V

LEN

Serial interface latch signal input, rising edge triggered

Digital V

(GND) connection

31/32

No connection

LVN

Low supply V

voltage indicator comparator output, reset active low output

SCLK

Serial interface system clock input

Serial interface data input

RSO

Received (regenerated) SAT output

TSO

Transmit SAT output, regenerated or transponded

DATO

Transmit data filter output.

Analogue V

(GND)

MOD

Modulation output: sum of Speech, Data and SAT

SUMO

Modulation summing amplifier output

SUMI

Modulation summing amplifier input

TLPO

Transmit audio lowpass filter output

BGAP

Bandgap voltage output, 10 nF to GND

V485

Hard limiter gain selection for 3.75 V or 4.85 V nominal supplies

No connection

DTMF

DTMF tone output

AMPO

Auxillary op-amp output

No connection

AMPI

Auxillary op-amp inverting input (non-inverting internally connected to VMIDTX)

PREIN

Transmit pre-emphasis filter input

TBPO

Transmit bandpass filter output

CIN

Compressor audio input, 10 nF from TBPO

CRCIN

Compressor time constant input, 100 nF to GND, 180 k

to CRCOUT

VMIDTX

TX path reference voltage, 82 nF to GND

CRCOUT

Compressor time constant output, 180 k

to CRCIN

No connection

COUT

Compressor audio output, 33 nF to PREIN

TXC

Transmit handsfree audio level sensing rectifier smoothing filter, 68 nF to GND

RXC

Received handsfree audio level sensing rectifier smoothing filter, 68 nF to GND

IPS

Transmit audio gain INPSENSE adjustment block input

SLO

Soft limiter output

Microphone input

MICBIAS

Bias for electret or active microphone

PIN Descriptions

Note: FP1 = 10 x 10mm package, FP2 = 7 x 7 mm package

ACE9040

Advance Information

Characteristic

Symbol

Value

Unit

Conditions

Min.

Typ.

Max.

Supply Current and Power Down Modes
Operating supply current

= 4.85 V R

REF

= 100 k

= 3.75 V R

REF

= 68 k

Standby
Attenuation of all inputs signals

Wakeup response time

Sleep (Standby with CLK stopped)
Supply current*

DD(SLEEP)

200

µA

STBY bit set V

= 3.75

Delay between setting STBY bit and

µs

stopping clock
Delay to starting clock after wakeup

100

µs

Characteristic

Value

Unit

Conditions

Min.

Typ.

Max.

Transmission Path
Microphone Amp, MI to SLO pins
Input bias

Internal 150 k

bias resistor to V

Microphone input gain (LO)

MIS = 1, MLI = 0, MIG = 0

Microphone input gain (HI)

MIS = 1, MLI = 0, MIG = 1

Microphone crosstalk (no MI signal)

MIS = 1, MLI = 0, MIG = 1

Line input, LI to SLO pins
Input bias

Internal 100 k

bias resistor

LI input Gain (0dB)

0.5

MIS = 0, MLI = 0, MIG = 0

LI input Gain (LO)

MIS = 1, MLI = 1, MIG = 0

LI input gain (HI)

MIS = 1, MLI = 1, MIG = 1

LI input crosstalk (no LI signal)

MIS = 1, MLI = 1, MIG = 1

Soft Deviation Limiter, LI to SLO pins
Nominal gain

Limiter not functioning.

Attenuation range

Attenuation steps

0.27

0.5

0.67

Distortion

%THD

Output at 1 Vrms

Attack level:Hard limiter output

% V

Attack level at TBPO pin

% V

d.c. input at IPS
TEST[1:0] = 11

Attack time

µs

Per gain step when signal outside
threshold

Decay time

1.68

Per gain step

INPSENSE Gain Stage, IPS to TBPO pins
Nominal gain

7.5

8.5

Input = 100 mV

rms,

INPS[4:0] = 15, THF = 0 dB,

Gain adjustment range

12.8

Relative to nominal gain
Input = 100 mV

rms,

Gain step size

0.6

0.8

1.2

INPS[4:0] = 0 to 31, THF = 0 dB

Electrical Characteristics

These characteristics are guaranteed over the following conditions unless otherwise stated (Note 1):

AMB

= 40

°C to + 85 °C, V

= 3.6 V to 5.0 V

Note 1. 100% production tested at 25

°C but guaranteed over specified temperature range.

* Standby current measured with the 1.008 MHz clock stopped and SCLK at a level <200 mV.

Advance Information

ACE9040

Characteristic

Value

Unit

Conditions

Min.

Typ.

Max.

TX Audio Bandpass Filter TXBPF, IPS to TBPO
Noise

dBV

Distortion

%THD

1 Vrms output

Frequency response relative to 1040 Hz

60.5

38.5

f = 60 Hz

25.5

10.5

f = 184 Hz INPSENSE = 0 dB

1.0

+ 0.5

f = 430 Hz THF = 0 dB

0.5

+ 0.5

f = 676 Hz, 1040 Hz

0.5

+ 0.5

f = 1410 Hz, 1900 Hz

1.5

0.5

f = 3260 Hz

3.0

1.5

f = 3500 Hz

10.5

= 4120 Hz

20.5

15.5

f = 5590 Hz

90.5

30.5

f = 9900 Hz

TX Handsfree Gain Stage HFGAIN
Nominal gain

Gain range

52.5

45.5

THF[2:0] = 0 to 7

Gain step size

6.5

7.5

0 to 21 dB

Gain step size

28 to 49 dB

TX Compressor Stage, CIN to COUT pins
Unity gain level

636

707

777

mVrms

= Vref (Unaffected level)

Input range

0.79

1000

mVrms

Linearity CIN to COUT:

± 0.5

CIN = Vref + 3 dB to Vref - 59 dB

(Deviation from 2:1 I/O relationship)

BW = 300 Hz to 3.4 kHz

Attack time

12 dB step: - 8 dB to - 20 dB relative
to the unity gain (Vref) level

Decay time

13.5

Attack & Decay levels = 1.5 and 0.75
of steady state final value

Distortion

%THD

BW = 300 Hz - 3.4 kHz

Frequency response

± 0.2

BW = 300 Hz - 3.4 kHz

TX Pre-emphasis, PREIN to TLPO pins
Input impedance

Internal compressor and BAR:
Nominal gain TACS

7.5

6.5

COMP[2:1] = 10 or 01 at 1 kHz

Nominal gain AMPS

11.5

10.5

External compressor and bypass:
Nominal gain AMPS & TACS

0.5

+ 0.5

COMP[2:1] = 11 or 00 at 1 kHz

Frequency response

5.8

6.2

dB/

TEST[1:0] = 01

Octave

PREEMPH = 0 (active)
f = 300 to 3400 Hz

Electrical Characteristics

These characteristics are guaranteed over the following conditions unless otherwise stated (Note 1):

AMB

= 40

°C to + 85 °C, V

= 3.6 V to 5.0 V

ACE9040

Advance Information

Characteristic

Value

Unit

Conditions

Min.

Typ.

Max.

Hard Deviation Limiter
Gain

13.5

V485 pin = 0 V (for V

= 3.75 V)

15.5

16.5

V485 pin = V

(for V

= 4.85 V)

Low Pass Filter TXLPF, PREIN to TLPO pins
Distortion

1.5

%THD

1.5 Vp-p Output level

Noise

dBV

BW = 30 Hz to 30 kHz

Frequency response TACS/AMPS

0.3

0.7

f = 307 Hz

Relative to 1 kHz

0.5

+ 0.5

f = 676 Hz, 1040 Hz

0.5

+ 0.5

f = 1410 Hz, 1900 Hz

3.0

1.5

f = 3010 Hz

38.0

13.0

f = 3500 Hz

60.0

38.0

f = 4120 Hz

60.0

38.0

f = 5590 Hz

60.0

38.0

f = 9900 Hz

60.0

35.0

f = 11870 Hz

60.0

35.0

f = 14950 Hz

Gain

8.5

7.5

Attenuation with TXLPF bypassed

TEST[0] = 1

Gain Stage AUDIODEV, PREIN to TLPO
Nominal gain

Output at TLPO

Gain adjustment

- 2.8

3.2

Attenuation step size

0.2

0.4

0.6

Control bits: AUDEV[3:0]

TXM switch attenuation

AUDIODEV = 0 dB

Combined TX path
Gain with 3.5

µV at Microphone input

33.5

37.5

INSENSE = 0 dB, V485 = 0 V

Distortion

1.0

% THD

THF & AUDIODEV = 0 dB

Noise

55.0

dBV

MI gain = 22 dB, V

= 3.6 V

Output d.c. level

1.65

1.9

Compressor Bypassed

Electrical Characteristics

These characteristics are guaranteed over the following conditions unless otherwise stated (Note 1):

AMB

= 40

°C to + 85 °C, V

= 3.6 V to 5.0 V

Advance Information

ACE9040

Electrical Characteristics

These characteristics are guaranteed over the following conditions unless otherwise stated (Note 1):

AMB

= 40

°C to + 85 °C, V

= 3.6 V to 5.0 V

Characteristic

Value

Unit

Conditions

Min.

Typ.

Max.

Receive Path
RX Input stage RXSENSE, RXI to RBPO pins
Input bias

Internally biased to V

/2 by 150 k

Nominal gain

7.25

8.75

Gain adjustment range

6.4

Input 40 mVrms at RXI

Gain adjustment step size

0.2

0.4

0.6

RXM = 1, RXSENSE = 0 to 31

RX Audio Bandpass Filter RXBPF
Gain

Distortion

%THD

At 1 kHz with 40 mVrms input

Noise

BW= 30 Hz to 30 kHz

Frequency Response

90.0

45.0

f = 60 Hz RXSENSE = 0 dB

Relative to 1040 Hz

15.0

7.0

f = 184 Hz

COMP[1:0] = 00

2.0

+ 0.5

f = 430 Hz

0.5

+ 0.5

f = 676 Hz, 1040 Hz

0.5

+ 0.5

f = 1410 Hz, 1900 Hz

3.0

0.5

f = 3260 Hz

10.0

6.0

f = 3500 Hz

40.0

25.0

f = 4120 Hz

40.0

25.0

f = 5590 Hz

90.0

40.0

f = 9900 Hz

RXM mute switch attenuation

Output switched to V

/2 when

muted.

Rx Internal Expander

Gain EXPGAIN: internal

11.8

12.3

12.8

COMP[2:1] = 10

external and bypass

COMP[2:1] = 00 or 11

Unity gain level

850

1000

1200

mVrms

= Vref (Unaffected level)

Linearity EIN to EOUT

± 1

EIN = Vref to Vref - 33 dB

(Deviation from 2:1 input/output)

BW = 300 to 3400 Hz

Distortion

%THD

1 Vrms

Frequency response

± 0.2

300 to 3400 Hz

Attack time

6 dB step (- 4 dB and -10 dB) relative
to the unity gain (Vref) level at 1 kHz
to pin EIN. Output at EOUT.

Decay time

13.5

Attack and delay time levels = 0.57
and 1.5 of final steady state value.

RX Volume Control RXLEVEL
Nominal Gain

RXV[2:0] = 3, RHF = 0 dB

Gain adjustment range

RXV[2:0] = 0 to 7

Gain adjust step size

EARSENSE = 0 dB, Sidetone = 0 dB

RX Handsfree Gain Stage HFATTEN
HFGAIN to EAMP nominal gain

0.4

RHF, RVX, EARSENSE = 0 dB,
SD =0

Gain range

52.5

45.5

RHF[2:0] = 0 to 7

Gain control step size

6.5

7.5

0 to 21 dB

Gain control step size

28 to 49 dB

RX Line Driver LODRIVE
LO gain

RVX = 0 dB, RHF = 0 dB, HIZ =1

Distortion

%THD

1.0 Vrms output

LO mute

HIZ = 0

Noise

dBV

BW = 30 Hz to 30 kHz

LOoutput during mute

1.5

2.1

= 3.6 V

ACE9040

Advance Information

Characteristic

Value

Unit

Conditions

Min.

Typ.

Max.

Rx Earpiece Gain Adjustment EARSENSE
Nominal gain

Total gain

- 2.8

3.2

EARS[3:0] = 0 to 15

Gain adjustment step size

0.2

0.4

0.6

RVX = 0 dB, RHF = 0 dB, SD = 0

Distortion

% THD

Output 1 Vrms

Rx Sidetone Path, IPS to EAMPI
Attenuation at EARSENSE amp input

EARSENSE = 0 dB

Sidetone mute

SD = 0

Rx Earpiece Drivers EPOP & EPON
EPON single ended gain

5.5

6.5

Output = 2 Vpp,
120

EPON to EPOP

EPOP single ended d.c. level

1.7

1.9

= 3.6 V, EPH1 = 1, EPH0 = 0

EPOP single ended a.c. level

EPON single ended distortion

% THD

Output = 2 Vpp

EPON & EPOP differential gain

11.5

12.5

150

(± 20 %) EPON to EPOP

EPOP differential distortion

%THD

Output = 4 Vpp, EPH1 = 1, EPH0 = 1

Earpiece mute switch attenuation

EPH0 = 0 & EHP1 = 0

EPON external mode:

(± 20 %) + 3.3 µF to GND,

EPON gain relative to EAMPI

5.5

6.5

EAMPFB open, Input = HFGIN

EPON distortion

% THD

Output = 1.1 Vpp

EPOP output current external mode

µA

At V

& 0 V

EPON & EPOP mute

EPH1 = 0, EPH0 = 0

EPOP Noise

dBV

EPH1 = 1, EPH0 = 1

Transmit Data Path
TX Data Filter 16 kHz & 20 kHz
Input bias at DATI

Internally tied via 800 k

resistor to

/2.

Nominal gain

- 6.5

- 6

- 5.5

Input = 1 Vrms

Distortion

1.5

%THD

Output = 1.5 Vp-p

Noise

-60

dBV

BW = 30 Hz to 30 kHz

DATM mute switch attenuation

Data Filter frequency response
16 kHz (TACS)

0.3

f = 676 Hz, 1040 Hz

0.3

f = 4120 Hz

0.1

0.7

f = 12120 Hz

0.9

1.6

f = 13960 Hz

2.5

1.5

f = 14950 Hz

DATM = 1

5.0

2.0

f = 16050 Hz

DATADEV = 0 dB

5.0

3.0

f = 16420 Hz

Relative to 1040 Hz

6.0

4.0

f = 17040 Hz

DATAF[1:0] = 10

7.0

5.0

f = 18020 Hz

11.0

9.0

f = 19990 Hz

12.0

10.0

f = 20970 Hz

Electrical Characteristics

These characteristics are guaranteed over the following conditions unless otherwise stated (Note 1):

AMB

= 40

°C to + 85 °C, V

= 3.6 V to 5.0 V

Advance Information

ACE9040

Characteristic

Value

Unit

Conditions

Min.

Typ.

Max.

TX Data Filter 16 kHz & 20 kHz (continued)
Data Filter frequency response
20 kHz (AMPS)

0.3

f = 676 Hz, 1040 Hz

0.3

f = 4120 Hz, 16050 Hz

0.3

1.5

f = 16050 Hz

2.5

1.0

f = 18020 Hz

3.0

1.5

f = 18880 Hz DATAF[1:0] = 11

4.0

2.0

f = 20240 Hz DATM = 1

5.0

3.0

f = 20540 Hz DATADEV = 0dB

5.5

3.5

f = 20970 Hz Relative to 1040 Hz

7.0

5.0

f = 21960 Hz

8.0

6.0

f = 22820 Hz

10.0

8.0

f = 24050 Hz

TX Data Gain Stage DATADEV, DATI to DATO pins
Nominal gain

Gain adjustment

- 2.8

3.2

DATD[3:0] = 7

Gain adjustment steps

0.2

0.4

0.6

DATM = 1 DATAF[1:0] = 00

TXSAT and RXSAT Bandpass Filters 6 kHz
RXSAT Filter
RXSAT gain

Input = 400 mVrms at 6030 Hz,
SATDEV = 0 dB, SATM = 1,
SATS = 0dB

RXSAT 6 kHz frequency response

90.0

35.0

f = 2520 Hz Relative to 6030 Hz

90.0

35.0

f = 3500 Hz

SATS = 0 dB,

90.0

35.0

f = 4120 Hz

TACS = 1,

29.0

24.0

f = 4980 Hz

SATD = 15 (0 dB),

0.30

0.50

f = 5900 Hz

SATM = 1

0.10

0.35

f = 5960 Hz

0.10

0.35

f = 6030 Hz

0.30

0.6

f = 6090 Hz

26.5

22.0

f = 7010 Hz

90.0

29.0

f = 8060 Hz

90.0

35.0

f = 9040 Hz

90.0

35.0

f = 9290 Hz

RSO Schmitt output

5.5

6.0

6.5

kHz

SATS = 0 dB, TACS = 1

Electrical Characteristics

These characteristics are guaranteed over the following conditions unless otherwise stated (Note 1):

AMB

= 40

°C to + 85 °C, V

= 3.6 V to 5.0 V

ACE9040

Advance Information

Characteristic

Value

Unit

Conditions

Min.

Typ.

Max.

TXSAT Filter 6 kHz
TXSAT gain

29.0

25.0

TACS =1, SATS = 1, Output = 1 Vpp
at 6030 Hz

TXSAT 6 kHz frequency response

90.0

35.0

f = 2520 Hz Relative to 6030 Hz

90.0

35.0

f = 3500 Hz

SATS = 1

90.0

35.0

f = 4120 Hz

TACS = 1

29.0

24.0

f = 4980 Hz

SATD = 15 (0 dB)

0.30

0.50

f = 5900 Hz

SATM = 1

0.10

0.35

f = 5960 Hz

0.10

0.35

f = 6030 Hz

0.30

0.50

f = 6090 Hz

26.5

22.0

f = 7010 Hz

60.0

35.0

f = 8060 Hz

60.0

35.0

f = 9040 Hz

80.0

35.0

f = 9290 Hz

TXSAT Noise

71.0

dBV

Gain Stage SATDEV
Nominal gain

Gain adjustment range

- 4.5

4.8

SATS = 0, TACS = 1, SATM = 1

Gain adjustment size

0.05

0.3

0.55

SATD[4:0] = 0 to 31

Distortion

% THD

Output = 1.1 Vpp

SATM switch mute attenuation

SATM = 0

DTMF Generator
DTMF output level

mVrms

= 3.6 V, high & low tone

DTMF single tone distortion:
TONEM switch on (via TBPO)

% THD

Low group, TONEM = 1

TONEM switch off

TONEM = 0

DTMF switch on (via RBPO)

% THD

High group, DTMFM = 1

DTMF switch off

DTMFM = 0

DTMF high group pre-emphasis

0.5

DTWIST = 0

1.5

2.5

DTWIST = 1

Gain Stage TXSENSE, SUMI to MOD pins
Gain

- 0.5

0.5

Output at MOD.

Gain adjustment

- 2.8

3.2

TXSEN[3:0] = 0 to 15

Gain adjustment step size

0.2

0.4

0.6

Distortion

%THD

Output = 1 Vrms

Noise

dBV

BW = 30 Hz to 30 kHz

Electrical Characteristics

These characteristics are guaranteed over the following conditions unless otherwise stated (Note 1):

AMB

= 40

°C to + 85 °C, V

= 3.6 V to 5.0 V

Advance Information

ACE9040

Electrical Characteristics

These characteristics are guaranteed over the following conditions unless otherwise stated (Note 1):

AMB

= 40

°C to + 85 °C, V

= 3.6 V to 5.0 V

Characteristic

Value

Unit

Conditions

Min.

Typ.

Max.

Handsfree Rectifiers
Attack time

Capacitors to GND =

Decay time

68 nF at TXC & RXC pins

TX nominal output levels:

= 3.75 V

d.c. offset

0.3

0.5

Input at IPS = 0 mVrms

a.c. level

1.4

1.5

1.65

Input at IPS = 40 mVrms, 1 kHz

INPSENSE = 0 dB, HFS = 0

HFP = 1

RX nominal output levels:

= 3.75 V

d.c. offset

0.3

0.5

Input at HFGIN = 0 mVrms

a.c. level

1.1

1.2

Input at HFGIN = 100 mVrms, 1 kHz
HFS =1, HFP = 1

Voltage Outputs
DEC & BIAS output voltage

1.70

-V

)/2

1.9

= 3.6 V, 3.3

µF decoupling to

GND at DEC pin

Microphone Bias: Source 1 mA

2.7

2.9

MLI = 0, MIS = 1, V

= 3.6 V

Sink 1 mA

2.7

2.9

MLI = 0, MIS = 1, PD = 0

Microphone disabled

0.1

0.10

MLI = 0, MIS = 0

External Reference Resistor

100

= 4.85 V

connected from pin RREF to GND

= 3.75 V

Bandgap at BGAP

1.10

1.35

LVN Supply Voltage Comparator

Default condition

= 3.6 V

µA

(high at V

0.2 V)

= 3.1 V

2.00

20.0

(low at 0.4 V)

LVN comparator operating lower limit

of V

ACE9040

Advance Information

Figure 3a - Serial Interface Input Timing

Electrical Characteristics

These characteristics are guaranteed over the following conditions unless otherwise stated (Note 1):

AMB

= 40

°C to + 85 °C, V

= 3.6 V to 5.0 V

Characteristic

Symbol

Value

Unit

Conditions

Min.

Typ.

Max.

DC Characteristics
Logic input high

0.7 x V

+ 0.3

Logic input low

- 0.3

0.3 x V

Input Capacitance

logic inputs leakage current

ILK

± 1

µA

SCLK, SD, LEN inputs
V

= 3.6 V & 0.0 V

AC Characteristics
Clock input frequency: Serial

CLK

1.008

MHz

interface & SC Filters

-100

100

ppm

Deviation from 1.008 MHz

Clock duty cycle

Number of clock rising edges to

clock

input data

cycles

Clock cycles between latch pulses

clock

on LEN

cycles

Clock cycles before power-up and

clock

after powerdown

cycles

Data setup time

= 3.75 V

± 0.1 V.

Data hold time

= - 40

°C to + 85 °C

Clock low

cll

400

600

Clock high

clh

400

600

Clock high to latch high

440

Latch high to clock high

220

Latch high

240

Rise and fall times

All digital inputs

Power Supply Rejection Ratio:

PSRR

= 3.8 V + 100 mVpp (a.c.)

COMP[2:1] = 00.

TX path (LI to TLPO)

LI = 0 dB, V485 = 13.5 dB
INPSENSE = 0 dB, softlimit on.

RX path (RXI to EPOP)

AUDIODEV, RXSENSE = 0 dB
THF, RHF, EARSENSE = 0 dB
RXV, SIDETONE off.

Crosstalk TX to RX

-45

MOD = 0.2 V

RMS

(MOD to EPOP/EPON)

clh

cll

SCLK

Data

Latch

Advance Information

ACE9040

Description

the control bits for one of the standards are set, others are
under user control.

Power saving operates when an individual block is de-

selected and for the whole circuit when in Standby. The circuit
combines high performance with minimum power
consumption and uses as few external components as
possible.

Serial Control Bus

All functions are controlled via a three wire serial

interface. Input is via pins SD for serial data, SCLK for the clock
input and LEN for the control message latch signal.

Incoming data bits are clocked in on the rising edges of

SCLK clock input. At the end of each control message
comprising three 8-bit data bytes, the rising edge of the LEN
pulse latches in the data. A system controller should clock
data out on clock falling edges to ensure the maximum timing
margins.

The SCLK clock input must be at 1·008 MHz and

continuous whenever the ACE9040 is active because
ACE9040's switched capacitor filters use clocks derived from
SCLK to set frequency responses.

ACE9040 expects a minimum of 30 clock cycles between

LEN latch pulses, including the clock cycle containing the latch
pulse. A minimum of 8 clock cycles before the beginning of an
Operate command or after a Standby command are expected.

Three data bytes DATA1, DATA2, and DATA3 contain

bits for system selection, control and mute switches, gain
control and filter response settings, as shown in figure 10. The
last two bits of DATA3, DATA3[1] and [0], determine the
message type, either "Operation", "Initializing mode 0",
"Initializing mode 1" or "Handsfree". The details of these four
modes are described in tables 2 to 19.

ACE9040 combines all the voice, data and signalling

processing circuits for analog cellular telephones operating
with the AMPS or TACS systems.

Transmit channel functions comprise a microphone

amplifier, soft limiter, bandpass speech filter, compressor,
pre-emphasis filter, hard limiter, lowpass transmit filter and a
gain control stage to set the deviation. Additional transmit
circuits include a DTMF generator, a lowpass filter for either
control data or signalling tone (ST), filters for supervisory
audio tone (SAT), either transponded or locally re-generated,
and deviation setting amplifiers for Data, ST and SAT. The
outputs from the transmit functions feed a modulation
combiner whose gain can be adjusted before driving a
modulator and external power amplifier.

ACE9040's receive path consists of a bandpass filter,

expander, volume control and power amplifier to directly drive
the earpiece, either differentially or in single ended modes.
Sidetone and DTMF tones can be introduced into the receive
path.

Gain settings, filter characteristics and system control is

programmed via a three wire serial interface to give optimum
operation with either the AMPS or TACS analog cellular
systems.

To implement a handsfree function, both transmit and

receive paths have rectifiers which enable signal amplitude
monitoring via an external pin and signal path attenuators
controlled via the serial interface.

All filter characteristics are set by ratioed on-chip

components and by a fixed externally input clock rate of
1·008 MHz and do not need trimming, filter response options
are selected via the serial interface.

Gain adjustments for different system specifications and

component tolerancing are set via the serial interface using
gain control blocks in the transmit and receive signal paths.
These eliminate the need for any mechanically adjusted
potentiometers. Some gain levels change automatically when

DATA3[1]

DATA3[0]

Mode

"Operation"

"Initializing mode 0"

"Initializing mode 1"

"Handsfree"

Figure 10 - Serial Receive Bus Timing

Table 1 - Mode Selections

DATA1

DATA2

DATA3

SCLK

LEN

7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0

EARLIEST
START OF
NEXT
MESSAGE

ACE9040

Advance Information

EPH1

EPH0

Function

Earphone mute

External Earpiece (EPON to ground)

Single ended output (EPON to EPOP)

Differential output (EPON and EPOP)

MLI

MIS

Function

LI selected, no gain

MI selected, Micamp gain

NOT ALLOWED

LI selected, Micamp gain

Data bit

Bit Name

Function

Effect when

at 0

at 1

DATA3:

[0]

DATA3[0]

Bus Mode Select

Must be "1"

[1]

DATA3[1]

Bus Mode Select

Must be "0"

[2]

Power Down

Operate

Standby

[5:3]

RXV[2:0]

Receive Volume

See table 3

[6]

HIZ

Line Output Drive Enable

Off

[7]

EPH1

Earpiece Mute

See table 5

DATA2:

[0]

RXM

Receiver Audio Mute

Muted

[1]

SATM

Transmit SAT Mute

Muted

[2]

DATM

Transmit Data Mute

Muted

[3]

TXM

Transmit Audio Mute

Muted

[4]

MLI

Microphone Select

See table 4

[5]

DTMFEN

Enables each DTMF tone selection

Disabled

Enabled

[7:6]

DTMFMODE[1:0]

DTMF Tone Select

See table 6

DATA1:

[0]

DTMFM

Transmit DTMF Switch

Speech

DTMF

[1]

TONEM

DTMF RX path Confirm Tone Switch

Speech

DTMF

[5:2]

DTMF[3:0]

DTMF Code Select

See table 7

[6]

MIS

Line Input Select

See table 4

[7]

PREEMPH

Transmit Pre-emphasis Bypass

Active

Bypassed

RXV[2]

RXV[1]

RXV[0]

Gain in dB

Table 3 - Receiver Volume Control Nominal Levels set by

RXV[2:0].

Table 4 - Microphone Input Select

Table 5 - Earphone Mode Select

(EHP0 in Initializing mode 0)

DTMFMODE[1:0] bits

Tone generated

1 and 0

0 and 0

No tone.

0 and 1

Low frequency only.

1 and 0

High frequency only.

1 and 1

Dual tones.

Table 6 - DTMF Mode Selection

Control Bus: Operation Mode

DTMF[3:0] bits Keypad

Low Freq.

High Freq.

3 2 1 0

legend

Hz.

0 0 0 0

697

1209

0 0 0 1

697

1336

0 0 1 0

697

1477

0 0 1 1

697

1633

0 1 0 0

770

1209

0 1 0 1

770

1336

0 1 1 0

770

1477

0 1 1 1

770

1633

1 0 0 0

852

1209

1 0 0 1

852

1336

1 0 1 0

852

1477

1 0 1 1

852

1633

1 1 0 0

941

1209

1 1 0 1

941

1336

1 1 1 0

941

1477

1 1 1 1

941

1633

Table 2 - "Operation Mode", DATA3[1:0] = 01.

Table 7 - DTMF Tones

Advance Information

ACE9040

Data bit

Bit Name

Function

Effect when

at 0

at 1

DATA3:

[0]

DATA3[0]

Bus Mode Select

Must be "0"

[1]

DATA3[1]

Bus Mode Select

Must be "0"

[2]

EPH0

Earpiece Mode Select

See table 5

[3]

DTWIST

DTMF Pre-emphasis

0 dB

2 dB

[4]

PDLVC

Power Supply Comparator

Active

Power Down

[6:5]

COMP[2:1]

Compander Control

See table 9

[7]

INPS[0]

Transmit Audio Gain Adjust

See table 10

DATA2:

[3:0]

INPS[4:1]

Transmit Audio Gain Adjust

See table 10

[7:4]

RXSEN[3:0]

Receive Audio Gain Adjust

See table 11

DATA1:

[0]

RXSEN[4]

Receive Audio Gain Adjust

See table 11

[5:1]

SATD[4:0]

SAT Modulation Gain

See table 12

[6]

Sidetone Enable

Off

[7]

SOFTLIMIT

Enables Softlimiter

Off

Table 8 - "Initializing Mode 0", DATA3[1:0] = 00.

INPS[4] INPS[3] INPS[2] INPS[1] INPS[0]

Gain (dB)

12·0

11·2

+ 12·0

+ 12·8

COMP[2]

COMP[1]

Mode

Bypass Compander

Internal Compander

External Compander

BAR Signal Input Mode
(RBPO at high impedance)

RXSEN[4]

RXSEN[3]

RXSEN[2]

RXSEN[1]

RXSEN[0]

Gain (dB)

6·0

5·6

+ 6·0

+ 6·4

SATD[4]

SATD[3]

SATD[2]

SATD[1]

SATD[0]

Gain (dB)

4·5

4·2

+ 4·5

+ 4·8

Table 9 - Compander Operating Modes set by COMP[2:1].

Table 10 - INPSENSE Transmit Audio Nominal Gain

settings by INPS[4:0].

Table 11 - RXSENSE Receive Audio Nominal Gain settings by RXSEN[4:0].

Table 12 - SATDEV Transmit SAT Nominal Modulation Gain settings by SATD[4:0].

Control Bus: Initializing Mode 0

ACE9040

Advance Information

TXSEN[3]

TXSEN[2]

TXSEN[1]

TXSEN[0]

DATD[3]

DATD[2]

DATD[1]

DATD[0]

Gain

AUDEV[3]

AUDEV[2]

AUDEV[1]

AUDEV[0]

(dB)

EARS[3]

EARS[2]

EARS[1]

EARS[0]

2·8

2·4

+ 2·8

+ 3·2

Data bit

Bit Name

Function

Effect when

at 0

at 1

DATA3:

[0]

DATA3[0]

Bus Mode Select

Must be "0"

[1]

DATA3[1]

Bus Mode Select

Must be "1"

[3:2]

TEST[1:0]

Test Mode Select

see table 14

[4]

SATS

SAT source Select

RXSAT

TXSAT

[6:5]

DATAF[1:0]

Data Filter Bandwidth Select

see table 15

[7]

TACS

Cellular System Select

TACS

DATA2:

[3:0]

TXSEN[3:0]

Combined Modulation Gain

see table 16

[7:4]

DATD[3:0]

Data Modulation Gain

see table 16

DATA1:

[3:0]

AUDEV[3:0]

Audio Modulation Gain

see table 16

[7:4]

EARS[3:0]

Earpiece "EARSENSE" Gain

see table 16

Control Bus: Initializing Mode 1

TEST[1]

TEST[0]

Test Mode

Operate mode (not in test mode)

Test DTMF

Bypass TXLPF

Bypass TXLPF & Softlimiter test

Table 14 - Test Modes selected by TEST[1:0].

Table 15 - Data Filter Bandwidths selected by DATAF[1:0].

Table 16 - TXSENSE, DATADEV, AUDIODEV, and EARSENSE

Nominal Gains set, respectively, by TXSEN[3:0], DATD[3:0],

AUDEV[3:0], and EARS[3:0].

DATAF[1]

DATAF[0]

Cut-off Frequency

16 kHz

20 kHz

See table 19.

Table 13 - "Initializing Mode 1", DATA3[1:0] = 10.

ACE9040

Advance Information

Circuit Operating Modes

ACE9040 has three operating modes: Operate, Standby

and Sleep. In Operate mode all parts of the circuit are active,
except for any explicitly powered down and the DTMF genera-
tor which only powers up when tones are generated. The pin
STBY is pulled high in Operate mode to supply V

to external

audio circuits, such as a compander.

Standby Mode

Standby mode is used when the cellular terminal is

waiting for a call and is selected by an "Operation mode"
control message with bit PD at "1". In this mode all analog
circuits, data paths, filters and their clock drivers are powered
down giving a greatly reduced supply current. In standby
mode all switch and level controls retain their previous state,
the pin STBY is not driven removing the V

supply from

external circuits. To leave Standby mode an operate com-
mand should be given by using an "Operation mode" control
message with bit PD at "0".

Sleep Mode

Sleep mode is the same as Standby but without a clock

input. To enter sleep mode the standby command should be
given and after a delay of at least 20

µs the SCLK clock

stopped. To wake-up from sleep mode, the the SCLK clock
must be started and after a delay of at least 100

µs an operate

command given.

Power on Reset

At power up ACE9040 is put into Standby mode.

ACE9040 is set up by the controlling processor via the serial
interface using four control messages: "Operation", "Initializ-
ing mode 0", "Initializing mode 1" and "Handsfree". Usually
the "Operation" control message would be sent last as it
contains the power down/up bit PD.

CELLULAR SYSTEM SELECTION

Two control bits are used to set the filter responses and

gain levels for the AMPS or TACS cellular systems. These bits
are TACS in control message "Initializing mode 1" and AMPS
in control message "Handsfree mode" and select the system
as shown in table 19.

Figure 11 - Transmit Voice Path

Transmit Voice Path

Table 19 - Cellular System Selection

Bits

System

AMPS

TACS

Selected

Not valid

TACS

AMPS

Not valid

SLO

IPS

10nF

SOFTLIMIT

0 to -30dB

22/32 dB

MIG

MLI

MIC.AMP

MIS

SOFT
LIMIT

3 and 97%

LEVELS

DETECT

-7dB TACS
-11dB AMPS
Compressor bypass
0dB AMPS/TACS

92% LEVEL

DETECT

TEST[1:0]

GAIN

CONTROL

COMP[2:1]

0dB @ 1kHz
+6dB/octave

PRE-

EMPAHSIS

PREEMPH

+15.4dB @ 3.75V
+16dB @ 4.85V

HARD

LIMIT

-8dB

TXLPF

TEST[1:0]

DTMF

INSPENSE

TEST[0]

-2.8 to + 3.2dB
AUDEV[3:0]

AUDIODEV

VMIDTX

TXM

TLPO
DRIVER

COMPRESSOR

2dB : 1dB

COMP[2:1]

TLPO

PREIN

33nF

100nF

82nF

COUT

VMIDTX

CRCIN

CRCOUT

CIN

VMIDTX

10nF

SIDETONE

TO RECEIVE

VOICE PATH

HFGAIN

TXBF

TBPO

TXC

68nF

RXC

HFS

HANDSFREE

RECTIFIER

0 to -49dB
THF[2:0]

0dB

NOM 8dB

-4 to +20.8dB

INPS[4:0]

DTMFM

Advance Information

ACE9040

Transmit Input Signal Preconditioning

Microphone Amplifier (MIG)

Microphone signals input at MI via switch MLI are

amplified by a gain selectable amplifier of either 22 dB or
32 dB, controlled by the MIG bit in the "Handsfree mode"
control message. The microphone amplifier's input can also
be connected to the line input LI via the MLI switch. The
microphone amplifier's output drives the soft limiter via switch
MIS which also allows higher level signals from the line input
LI to bypass the microphone amplifier to drive the soft limiter
directly. These two switches are controlled by the MIS and MIL
bits in the "Operation mode" control message.

Soft Limiter

Signal amplitude is restricted without clipping to the

correct level for maximum F.M. deviation by the soft limiter.
This operates as an AGC system, controlled by the signal
amplitude at the compressor input and the hard limiter output
later in the signal processing path. If the signal is too large at
either of these points the soft limiter forward gain is reduced.
The nominal soft limiter gain range of 0 to - 30 dB in 64 steps
of 0·5 dB covers all normal volume changes occuring during
a conversation. Soft limiter attack and decay times are set by
internal clocks derived from SCLK and ramp the gain steps at
nominal rates of one step down every 40

µs when the signal

is too large and one step up every 1·68 ms when the signal is
too small.

The soft limiter output at pin SLO is externally coupled

with a capacitor to the input pin IPS of the following gain adjust
stage, INPSENSE. When the speech channel is used to send
DTMF signalling tones a switch, controlled by bit DTMFM in
the "Operation mode" control message, selects the internal
DTMF signal rather than the speech signal at input IPS.

For test purposes TEST[1:0] bits in the "Initializing Mode

1" control message can configure switches to give access to
the softlimiter comparator inputs. When TEST[1:0] bits are
high the 3 & 97 % window comparator is switched from the
hard limiter output to PREIN input and the 92 % comparator is
switched to IPS input.

Inpsense Amplifier and TXBPF Filter

Both microphone and transmit voice path tolerances are

trimmed in the INPSENSE gain adjustment block following the
soft limiter and DTMF switch. INPSENSE has a nominal gain
of 8·0 dB with a trim range of - 12·0 to + 12·4 dB relative to the
nominal gain set by bits INPS[4:0] in the "Initializing mode"
control message.

Transmit signal preconditioning is completed by a band-

pass filter TXBPF to limit the audio signal to a speech
bandwidth of 300 Hz to 3·4 kHz. This filter uses switched
capacitor techniques and is preceded by an anti-alias filter and
followed by a smoothing filter to remove the clock from its
output. The typical frequency response is shown in figure 4
which also shows the mask defined by type approval limits.

Handsfree Functional Blocks

Between the transmit bandpass filter and the compressor

two extra functions are included for use with handsfree
operation. Firstly an attenuator HFGAIN is provided to give
progressive signal reduction in handsfree mode with a range
of 0 to - 49 dB in 7 dB steps, set by bits THF[2:0] in the
"Handsfree mode" control message. The HFGAIN
attenuator's output drives pin TBPO which is externally
capacitively coupled to the compressor input at pin CIN and
internally drives both the soft limiter and sidetone circuits.

The second function provided for handsfree operation is

a signal rectifier whose output, filtered by an external capacitor
at pin TXC, drives output pin HF via switch HFS with a d.c.
transmit level. Switch HFS is controlled by bit HFS in the
"Handsfree mode" control message. Under control of bit HFS
both receive and transmit levels are available at HF output pin
for external comparison to implement the handsfree function.
The handsfree system is further described in the section
Handsfree Operation.

Compressor

ACE9040 provides a 2:1 compressor to halve the transmit

dynamic range as required by analog cellular systems. Within
the operating signal range each 2 dB change in input level
gives a 1 dB change in output level. A transmit signal is input
through pin CIN and output on pin COUT, the signal is
referenced to a mid-supply voltage. CRCIN and CRCOUT are
connections for the external attack and delay time constant
setting components.

The compressor's nominal unity gain level is 707 mV.

Above this level the signal at CIN is attenuated and below this
level the signal is amplified to achieve the 2:1 dB compression.
Table 20 gives the nominal, Vmax and Vmin levels at CIN and
nominal levels at COUT corresponding with the TACS and
AMPS systems for 0 dB, maximum and minimum deviation.

The gain of the INPSENSE amplifier should be set so that

the compressor operates within these signal levels for a given
input signal at the MIC or LI input.

For the usual attack time of 3·0 ms and decay time of

13·5 ms a 180 k

resistor is connected between CRCIN and

CRCOUT pins and a 100 nF capacitor between CRCIN and
GND pins. An 82 nF capacitor should be connected between
the VMIDTX and GND pins. Attack and decay time is
measured with a 12 dB step, - 8 dB to - 20 dB relative to the
unaffected level. Attack and decay times are respectively
defined at points on the output envelope where it reaches
x 1·5 and x 0·75 of the final steady state level.

External compressor connections allow the use of

external coupling capacitors to remove d.c. offsets and
optionally an external compander. The compressor can be
internally bypassed allowing use of ACE9040 without
companding in non-cellular applications, or for test purposes.
Bits COMP[2:1] in the "Initializing mode 0" control message
control the operation of the internal compander and are used
to switch both the transmit compressor and receive expander
into or out of the signal path. When not in use the internal
compressor and expander are both powered down.

Table 20 - Compressor CIN and COUT signal levels for TACS and AMPS

System

Vmax at CIN

Vmin at CIN

Nominal Input at CIN

Nominal Output at COUT

Vrms

mVrms

(0dB) levels mVrms

levels mVrms

TACS

1.0

+ 25

1.77

- 30

200

AMPS

1.0

+ 23

2.25

- 30

225

ACE9040

Advance Information

Final Modulation Preparation

Pre-emphasis

A pre-emphasis filter follows the compressor to boost

the amplitude of higher audio frequencies by tilting the fre-
quency response by 6 dB per octave across the whole speech
band as shown in figures 5 and 8. To prevent overload in the
pre-emphasis filter the signal first passes through an
attenuator set to suit the system in use. If an external
compander is used or the companding function is bypassed
the gain is set to 0 dB. When using the internal compander the
gain is set to 7 dB for TACS or 11·0 dB for AMPS.
Compander bypass is determined by control bits COMP[2:1].
The pre-emphasis filter and attenuator input is pin PREIN and
the output is an internal connection to the hard limiter. The pre-
emphasis filter, but not the attenuator, can be bypassed if the
PREEMPH bit in the "Operation mode" control message is set
to "1".

Hard Limiter

To ensure compliance with the peak deviation specifi-

cation for cellular telephone systems, a hard limiter follows the
pre-emphasis filter to remove any transient level changes that
have passed through the soft limiter. This limiter will handle
large signals and has symmetrical clipping levels close to the
supply rails V

& V

(GND). To ensure clipping at the same

hard limiter input signal level with both the nominal power
supply voltages, hard limiter gain is adjusted by an external pin

"V485". For the nominal supply voltages of 4.85 V and 3.75 V
gain is respectively 16 dB (V485 pin at "1") and 13.5 dB (V485
pin at "0"). An 8 dB attenuator follows the limiter to prevent any
further clipping of the signal in the following transmit lowpass
filter.

TX Lowpass Filter TXLPF

A TXLPF lowpass filter with an optimised stop band

response limits the signal bandwidth to a cut-off frequency of
3·0 kHz, the frequency response is shown in figure 6. The
combined frequency response of the pre-emphasis and
lowpass filter stages is shown in figure 8. It is possible for test
purposes to bypass this lowpass filter by setting bit TEST[0] in
the "Initializing mode 1" control message to a "1".

Speech Deviation Level Setting

A controlled gain stage AUDIODEV sets the output level

to give the required FM deviation for speech. The gain is set
by bits AUDEV[3:0] in the "Initializing mode 1" control mes-
sage. AUDIODEV is followed by a transmit audio mute switch
enabled by bit TXM in the "Operation mode" control message.
A buffer drives output pin TLPO with the transmit speech
signal (and DTMF when in use) which is added with DATA/ST
and SAT tones in the modulation combiner.

Figure 12 - Transmit Data and DTMF Paths

Transmit Data and DTMF Paths

Transmit Data

Data communication from mobile terminals to base

stations in the AMPS and TACS cellular phone systems takes
place over the Reverse Control Channel (RECC) during call
set-up and in short bursts over the Reverse Voice Channel
(RVC) during a call.

RECC or RVC data is transmitted for AMPS or TACS as

a 10 kHz or 8 kHz Manchester Coded FSK signal

respectively. The data signal is generated by the ACE9050
"System Controller and Data Modem" or similar digital circuit
to drive ACE9040's DATI input pin. The DATI input data signal
is filtered using a 4th order Butterworth lowpass filter with
nominal - 3 dB points of 16 kHz for TACS, or 20 kHz for
AMPS. This filter is implemented using switched capacitor
techniques and is preceded by a continuous time anti-alias

DATI

DTMF[3:0]

DTWIST DTMFMODE[2:1]

DTMFM

IPS

TONEM

RXI

RECEIVE
VOICE PATH

TRANSMIT
VOICE PATH

DATO

DTMF

VMID

DATM

16/20kHz

DATAF[1:0]

-2.8 to + 3.2dB

DATD[3:0]

DATADEV

LOW-PASS

FILTER

DTMF

PRE-

EMPHASIS

MODE

Advance Information

ACE9040

filter, the output buffer includes a clock rejection filter. The cut-
off frequencies are programmed by bits DATAF[1:0] in the
"Initializing mode 1" control message. Filtered data passes
through the mute switch DATM and a variable gain stage
DATADEV with a range of 2·8 to + 3·2 dB to set the required
level of deviation. The mute switch is controlled by bit DATM
in the "Operation mode" control message. DATADEV is
controlled by bits DATD[3:0] in the "Initialising Mode 1" control
message. The data signal is buffered out to pin DATO to drive
the modulation combiner.

DTMF

DTMF tones are generated when commanded via the

serial interface and conform to the standard CCITT
frequencies. All 16 standard tone pairs or any individual tone
can be generated. To select DTMF tones data bits for
transmission DTMFEN, DTMFMODE[1:0] and DTMF[3:0]
need to be set using an "Operation mode" control message.
Data bits DTMFMODE[1:0] select low, high or both tones of
the pair as shown in table 6. Bits DTMF[3:0] select the tone
pair as shown in table 7. DTMFEN set to "1" enables DTMF

operation. To change DTMF tones, an "Operation mode"
control message with DTMFEN set to "0" must be sent to
cancel the previous selection as the DTMF tone can only be
changed when DTMFEN=0. This prevents any spurious
tones being generated.

An optional pre-emphasis of 2 dB of the high frequency

tone group above the level of the low frequency group is
enabled by bit DTWIST in the "Initializing mode 0" control
message.

DTMF tones can be selected to replace the speech in

either or both the transmit and receive paths. In the transmit
path setting bit DTMFM to "1" as in the "Operation mode"
control message will connect the DTMF signal to INPSENSE
gain adjustment block's input in place of the speech signal. In
the receive path setting bit TONEM to "1" in the "Operation
mode" control message will connect the DTMF signal to the
input to RXSENSE gain adjustment block in place of the
speech input at pin RXI. In each case the DTMFEN bit must
also be "1".

DTMF signals are generated as sinewaves by an internal

digital to analog converter and are smoothed by the transmit
and receive filters. DTMF waveforms start and stop at a zero
crossing to avoid transients in the filters and to limit their
bandwidth. The DTMF signal is brought out directly on pin
DTMF without further buffering.

The DTMF generator is powered down whenever a tone

is not being generated, by setting DTMFMODE[1:0] to "00".

Re-transmitted SAT

ACE9040 provides two alternative paths for Supervisory

Audio Tones (SAT). The first of these re-transmits the
received SAT tone to the base station after narrow band
filtering and providing signal level adjustment. This path is
selected by setting SATS bit to "0" in the "Initializing mode 1"
control message. The baseband signal from the receiver FM
discriminator drives the ACE9040 through the RSI pin into the
RXSAT 6 kHz bandpass filter required for AMPS or TACS.
The recovered SAT signal then passes through a 10 dB
amplifier and the SATS selector switch to the deviation setting

amplifier SATDEV. This is controlled by bits SATD[4:0] in the
"Initializing mode 0" control message. SAT then passes
through the SATM mute switch, controlled by bit SATM in the
"Operation mode" control message, to output pin TSO for
input to the modulation combiner.

Regenerated SAT

The alternative SAT path externally measures the SAT

frequency and generates a local tone to match. This route is

Transmit & Receive SAT Paths

Figure 13 - Transmit and Receive SAT Paths.

RSI

TSI

VMID

SATDEV

RSO

TSO

SCHMITT

RXSAT

6kHz FILTER

TXSAT

6kHz FILTER

-12dB

-15dB

10dB

SATM

SATS

-4.5 to +4.8dB

SATD[4:0]

ACE9040

Advance Information

selected by setting the SATS bit to "1" in the "Initializing

mode 1" control message. The ACE9040 connects the receive
filter RXSAT output through a Schmitt trigger to drive pin RSO
with a logic level version of the received SAT. A system
controller, such as an ACE9050, detects the frequency and
generates a digital signal to drive back into the ACE9040 on
pin TSI. After the signal level is reduced by -12 dB a 6 kHz
bandpass filter TXSAT converts this square-wave into a
sinewave. This is followed by a - 15 dB attenuator to reduce
the near logic level signal to a normal modulation level. This
signal drives the same SATDEV deviation setting stage and

mute switch SATM as the returned signal to give an output at
TSO.

Base Station Originated SAT

ACE9050, System Controller, can be used to generate a

squarewave SAT at 6 kHz which is input to pin TSI and filtered
by the TXSAT filter and output at TSO. The RXSAT filter path
with its output at RSO, can be used to filter the received SAT
from a mobile for verification by an external frequency detector
that the mobile is transponding the correct tone. This is the
same as the regeneration loop above but starting with genera-
tion.

Transmit Signal Combiner

Figure 14 - Transmit Signal Combining Network and Modulation Driver

component value tolerances can be made by setting:
AUDIODEV, SATDEV and DATADEV gains, described in
more detail in the sections TRANSMIT VOICE PATH,
TRANSMIT AND RECEIVE SAT PATHS, and TRANSMIT
DATA AND DTMF PATHS. A fine adjustment is made to the
combined signal level by TXSENSE which drives the modula-
tor through pin MOD. The gain of TXSENSE is set by bits
TXSEN[3:0] in the "Initializing mode 1" control message over
the range 2·8 to + 3·2 dB.

Used to modulate the transmitted r.f. output, the speech

and optional DTMF signals at TLPO, SAT at TSO, and data
and ST at DATO, are combined using an internal op-amp. This
op-amp has an inverting input at pin SUMI and output at pin
SUMO, the non-inverting input is internally biased to VMID.
With an external feedback resistor between SUMI and SUMO,
external resistors sum the inputs into pin SUMI and are chosen
for each different cellular system to select the relative and
absolute gains to give the correct deviation for each compo-
nent of the modulation. Individual fine adjustments to take out

AUDIO

SAT

DATA

TSO

TLPO

DATO

SUMO

SUMI

MOD

AUDIODEV

SATDEV

DATADEV

30dB

VMID

TXSENSE

-2.8 to +3.2dB

TXSEN[3:0]

Advance Information

ACE9040

Receive Voice Path

Figure 15 - Receive Voice Path

De-emphasis and Receive Signal Input

Demodulated FM signals drive the RXI input pin via an

external de-emphasis lowpass R-C filter of typically 180 k

and 10 nF. With TONEM switch set to RXI the input signal is
amplified in the block RXSENSE with a gain of + 8 dB.
RXSENSE also provides fine adjustment over a range of
- 6·0 dB to + 6·4 dB to take up signal level tolerances in the
receiver output. Fine gain adjustment is controlled by
RXSEN[4:0] bits in the "Initializing mode 0" control message.

When the DTMF generator in the transmit section is in use

its output can be switched into the receive path to replace the
RXI signal by setting bit TONEM in the "Operation mode"
control message to "1". This does not affect the transmitted
signal but allows the user to hear DTMF tones to confirm key
press operation.

RX Bandpass Filter

The RXSENSE amplifier's output is bandpass filtered to

the speech bandwidth of 300 to 3400 Hz by receive bandpass
filter RXBPF, as shown in figure 7. RXBPF uses switched
capacitor filter techniques but does not include an anti-alias
input filter as signals at RXI from the external receiver's output
and the internal DTMF generator's output are already
bandlimited. The F.M. discriminator output signals from

ACE9040's companion device "ACE9030: Radio Interface
and Twin Synthesiser" are bandlimited by its output filter and
ACE9040's internal DTMF tones are generated as sinewaves
without the need for a further anti-aliasing filiter.

RXBPF filter output passes through the receive mute

switch controlled by bit RXM in the "Operation mode" control
message and is buffered to drive pin RBPO by amplifier
EXPGAIN. During mute the RBPO pin is driven to the signal
ground voltage at mid supply (as found on pin BIAS).
EXPGAIN gain is nominally 12.3 dB when using the internal
expander and 0 dB when using an external expander. The
output circuit driving RBPO includes a smoothing filter to
remove clock noise.

Expander

Input to the expander at

pin EIN is coupled by an external

capacitor from RBPO to remove any d.c. voltage offsets.
Using external coupling also allows the option of using an
external compander or bypassing the expander if a linear
system is required. In either case the signal should feed back
into ACE9040 at pin HFGIN. ACE9040's compander can be
bypassed by setting bits COMP[2:1] in the "Initializing mode 0"
control message to "00".

A ring tone from the BAR (Beep, Alarm, Ring) generator

of ACE9050 "System Controller" can be added to the

EPOP

EPON

150W

64W

3.3

µF

EARPIECE
DRIVER

+ 6dB

EPH0/EPH1

EAMPO

HFGIN

10nF

EOUT

82nF

100nF

180k

ERCIN

ERCOUT

EIN

RBPO

33nF

1dB to 2dB

12.3dB

EXPGAIN

+5dB

HIZ

LODRIVE

0dB

RXBPF

DTMF INPUT

RXSENSE

8dB

-6.4 to 6.4dB

RXM

SIDETONE
INPUT (-19dB)

TONEM

RXI

180k

10nF

NOM -12dB

-21 to 0dB

0 to-49dB

RXLEVEL

HFATTEN

HANDSFREEE

RECTIFIER

-2.8 to + 3.2

EARSENSE

TXC

HFS

RXC

68nF

EAMPI

EAMP

EAMPFB

VMID

EPH0/EHP1

EXPANDER

VMIDRX

COMP[2:1]

ACE9040

Advance Information

expander input EIN by using an external summing network
and internally open circuiting the drive to pin RBPO during the
tone (not just muting the speech). This is achieved with bits
COMP[2:1] in the "Initializing mode 0" control message set to
"01".

Signal dynamic range at input pin EIN is doubled in the 1:2

expander to restore the original signal. Within the operating
signal range each 1 dB change in input level gives a 2 dB
change in output level. The expander output drives pin EOUT
which is coupled by an external capacitor to the input pin
HFGIN. The external connection allows use of an external
compander and removes any d.c. voltage offsets. Bits
COMP[2:1] in the "Initializing mode 0" control message can be
used to select external companding mode and power down
the internal compressor and expander.

The expander's unity gain level EIN to EOUT is 1V. Above

this level gain is applied to the signal at EIN and below this
level the signal is attenuated to achieve 1:2 dB expansion.
Table 21 gives nominal, Vmax and Vmin levels at EIN and
nominal levels at EOUT corresponding with the TACS and
AMPS systems for 0 dB, maximum and minimum deviation.

The gain of the RXSENSE amplifier should be set so that

the expander operates within these signal levels for a given
demodulated signal range at the RXI input.

Expander pins ERCIN and ERCOUT are used to set the

attack and decay times for the expansion process. For the
usual attack time of 3.0 ms and decay time of 13.5 ms, a
resistor of 180 k

is connected between ERCIN and

ERCOUT pins and a capacitor of 100 nF from ERCIN to GND.
An 82 nF capacitor should be connected between VMIDRX
and GND. Attack and decay time is measured with a 6 dB
step, - 4 dB to - 10 dB relative to the unaffected level. Attack
and decay times are defined respectively at points on the
output envelope where it reaches x 0.57 and x 1.5 of the final
steady state level.

Volume Control and Handsfree Attenuator

Two variable gain stages follow the expander, RXLEVEL

for the volume control and HFATTEN for use with handsfree
mode. Both blocks provide attenuation, expressed as gain to
assist system level design, RXLEVEL from 0 to - 21 dB and
HFATTEN from 0 to - 49 dB. RXLEVEL is controlled by bits
RXV[2:0] in the "Operation mode" control message and
HFATTEN is controlled by bits RHF[2:0] in the "Handsfree
mode" control message.

RX Audio Output: Line Output and Earpiece

Following the handfree attenuator the signal path splits

into two parallel paths: a line output for loudspeaking phones
and drivers for a dynamic earpiece or external handsfree
earpiece. Bits EPH1 and EPH0 in the "Operation Mode" and
"Initializing Mode 0" control messages respectively control the
operation of these outputs, see table 5.

The earpiece output path begins with a variable gain

stage EARSENSE which is controlled by bits EARS[3:0] in the
"Initializing mode 1" control message to give a gain range of -

2·8 to + 3·2 dB. A sidetone signal from the output of the
handsfree attenuator HFGAIN at pin TBPO is added at
EARSENSE's input if bit SD in the "Initializing mode 0" control
message is set to "1". The output of this block is at pin EAMPI.

The signal at pin EAMPI is amplified by an opamp whose

gain is set by external resistors, allowing overall gain setting
for different models of cellular terminal. A resistor is connected
from EAMPI to the amplifier input pin EAMPFB and a feedback
resistor is connected from the amplifier output EAMPO to
EAMPFB. The ratio of these two resistors sets the gain and the
opamp's output including feedback resistors should not be
loaded with less than 15 k

. Additional filtering can also be

added to the receive path using the EAMP opamp.

Earpiece

The earpiece drivers have outputs at pins EPOP and

EPON. One of three modes of output drive or a muted output
condition is selected by bits EPH1 and EPH0, see table 5.

A dynamic earpiece, typically of 150

resistance in

series with 800

µH, can be driven when connected between

pin EPON and EPOP. The drive mode can be either differen-
tial (EPH1 = 1, EPH0 = 1) or single ended (EPH1 = 1,
EPH0 = 0). The differential output, drives a minimum of 4 Vpp
into the load. The single ended output appears at EPON and
drives a minimum of 2 Vpp into a load referenced to pin EPOP,
which provides an output voltage at mid-supply.

Output drive is setup for an external handsfree earpiece

with EPH1 = 0 and EPH0 = 1. This load, typically of 64

resistance in series with 3.3

µF, is driven from pin EPON to

ground and the EPOP output is put into a high impedance
state. The minimum drive into this load is 1.1 Vpp.

The input for the EPOP and EPON output drivers is driven

by the signal at the EAMPO pin for single ended and differen-
tial outputs or from EAMPI directly for a handsfree earpiece,
bypassing the EAMP opamp. The gain from the earpiece
drivers' common input, to both EPON's inverting and and
EPOP's non-inverting outputs, is nominally + 6 dB.

Line Output

Line output amplifier LODRIVE with its output at pin LO

has a gain of + 5 dB and is used to drive an external audio
power amplifier. LODRIVE can drive a 1 k

load with a

minimum of 1 Vrms. The LO output can be put into a high
impedance state by setting bit HIZ in the "Operation mode"
control message to "0". During power down EPON and EPOP
and LO are tied to mid-supply voltage.

Handsfree Operation

In a handsfree telephone the simplest method of prevent-

ing `howl round' caused by acoustic feedback is to attenuate
either the forward or return path until the loop gain is too low
for sustained oscillation. The least active path is attenuated so
the signal level in each path must be detected and compared
so that the quieter can be attenuated.

In the ACE9040 the signal level in both the transmit and

the receive paths are rectified, with smoothing capacitors at

System

Vmax at EIN

Vmin at EIN

Nominal Input at EIN

Nominal Output at EOUT

Vrms

mVrms

(0dB) levels mVrms

levels mVrms

TACS

1.0

+ 12.5

- 15

245

AMPS

1.0

+ 12.3

-21

245

Table 21 - Expander EIN and EOUT signal levels for TACS and AMPS

Advance Information

ACE9040

OP-AMP Reference Current

Reference currents for all the internal op-amps are set by

an external resistor connected from pin RREF to ground (V

Nominal values are 100 k

for V

= 4·85 V and 68 k

for

= 3·75 V. A stable discrete resistor should be used to

ensure consistent operation over a wide temperature range.

Power Supply Comparator - Reset Output

A power supply comparator is provided to give a reset at

power-on and enable the system controller to initiate a clean
shut-down sequence if the battery voltage falls too low. When
V

is below a band-gap derived threshold the open-drain

outut pin LVN drives to a logic low. This occurs for V

exceeding 1 V but less than a typical threshold of 3·35 V. An
external resistor at LVN provides a pull-up to V

with a

capacitor to ground (V

) to give a power-on reset delay.

Typical values for RC are 220 k

and 150 nF. This RC

combination also removes short transients or noise pulses
from the signal at LVN during power up. If this comparator is
not required the bandgap and comparator can be powered
down by setting bit PDLVC in the "Initializing mode 0" control
message to a "1".

Serial Data Clock

All switched capacitor filter switching clocks are derived

from the serial data clock SCLK which must be fixed at
1·008 MHz to ensure correct frequency responses.

Amplifier

An uncommitted op-amp is provided with its non-inverting

input internally connected to VMID, inverting input at pin AMPI
and output at pin AMPO.

pins TXC and RXC respectively, to give d.c. voltages corre-
sponding to the signal levels.

A switch HFS with its output at pin HF can be internally

toggled between TXC and RXC to allow measurement of the
two levels at these pins by an external level sensing circuit
such as an analog to digital converter input of ACE9030. The
HFS switch is controlled by bit HFS in the "Handsfree mode"
control message.

The system controller after comparison of the voltage

levels at TXC and RXC pins can attenuate the weaker signal
path by up to 49 dB, in 7 dB steps using blocks HFGAIN for
transmit and HFATTEN for receive. Bits THF[2:0] and
RHF[2:0] in the "Handsfree mode" control message are used
to set the gains of HFGAIN and HFATTEN respectively. The
rate of change of gain should be limited in the system control-
ler to allow normal conversation.

Attack and decay time constants are set by the resistance

and capacitance on the TXC and RXC pins. With the internal
resistor to ground of approximately 500 k

and an external

capacitor to ground of 68 nF the normal attack time of 1 ms
and decay time of 35 ms is achieved. By adding a parallel
resistor the ratio of attack to decay time can be altered.

To save power in a hand portable when handsfree opera-

tion is not needed, the transmit and receive signal rectifiers
can be switched off by setting bit HFP in the "Handsfree mode"
control message to "0".

Biases and References

BIAS, VMID and MICBIAS

Within ACE9040 most signals are single ended and swing

either side of a mid-supply reference voltage. These internal
references are all labelled VMIDxx in this data sheet.

A low impedance voltage source at mid-supply for use as

an external signal ground is available on pin BIAS. This is a
buffered copy of the voltage at pin DEC which is from an
internal high impedance potential divider between V

and

. The DEC pin should be decoupled to ground with a

capacitor of greater than 3.3

µF. Two additional buffers pro-

vide copies of DEC's voltage at pins VMIDTX and VMIDRX,
these are used as internal signal grounds for the transmit and
receive paths respectively. VMIDTX and VMIDRX pins should
be decoupled to GND with 82 nF capacitors. By using
separate mid-supply signal grounds crosstalk due to the
compander time constant circuits and the speech and tone
signals are kept to a minimum.

Pin MICBIAS gives the bias needed for an electret micro-

phone nominally 0·8 times V

, e.g. when V

is 3·75 V

MICBIAS = 3 V

Figure 16 - Bias Circuits

3.3

µF

100k

68k

*VDD = 3.75V

DEC

BIAS

RREF

MICBIAS

BGAP

10nF

VMIDRX

VMIDTX

BIAS

GENERA

ACE9040

Advance Information

Gain and filter set-ups for TACS, AMPS and user control bits: Transmit

TACS

AMPS

User control bit(s)

Microphone amp

22 or 32 dB

MIG

Soft limiter

0 to - 30 dB

Internal

INPSENSE gain adjust

+ 8 dB

INPS[4:0]

(- 12.8 to + 12 dB)

TXBPF TX bandpass filter

0 dB

Fixed

HFGAIN, TX Handsfree attenuator

0 to - 49 dB

THF[2:0]

Compressor: Compression about

2:1

Fixed

unaffected level. (707 mVrms, - 3 dBV)

Pre-emphasis gain control

- 7 dB

- 11 dB

TACS & AMPS

(Internal compressor)

Pre-emphasis gain control

0 dB

Fixed

HARD LIMIT, Hard deviation limiter

+ 16.5 dB @ 4.85V

+ 13.5 dB @ 3.75V

V485 pin

+ 13.5 dB @ 3.75V

+ 16.5 dB @ 4.85V

TXLPF TX low pass filter

- 8 dB

Fixed

AUDIODEV,

0 dB

AUDEV[3:0]

(-2.8 to + 3.2 dB)

TXSENSE, signal

0 dB

TXSEN[3:0]

(-2.8 to +3.2 dB)

Nominal TX Channel Gain

28.5

dB @ 3.75 V

23.5

dB @ 3.75 V

(bypassed compressor)

31.5

dB @ 4.85 V

26.5

dB @ 4.85 V

Function Controlled by TACS & AMPS Bits

TACS

AMPS

Internal pre-emphasis gain control.

TACS = - 7.0 dB

AMPS= - 11.0 dB

Applications Information

To help with system set up tables 22 to 25 show

ACE9040's functions and their respective controlling bits.
Table 23 shows the gains and filter characteristics pre-
determined when setting the TACS & AMPS cellular system

selection bits. Tables 23 & 24 show these functions
respectively for the transmit and receive sections of ACE9040.
Table 25 shows the four control messages with an example of
the data to turn all ACE9040 functions on.

Table 22 - Functions Controlled by TACS & AMPS Bits

Notes:

1. Above the unaffected (0 dB gain) level the compressor attenuates and below this level it provides gain.
2. MIC gain = 22 dB

Table 23 - Transmit gain and filter set-ups for TACS, AMPS and user control bits

Advance Information

ACE9040

Gain and filter set-ups for user control bits: Receive

TACS

AMPS

User control bit(s)

External De-emphasis

- 21 dB

Fixed
externally

RXSENSE: Receive audio gain

+ 8 dB

Fixed

RXSENSE: Receive audio gain adjustment

- 6 to + 6.4 dB

RXSEN[4:0]

range

RXBPF: RX bandpass filter

0 dB

Fixed

RX Expander gain EXPGAIN: Internal

+ 12.3 dB

Fixed

RX Expander gain EXPGAIN: External

0 dB

Fixed

Expander: Expansion about unaffected

1:2

Fixed

level (1000 mV, 0 dBV)

RXLEVEL, Receive volume control

- 12 dB

RXV[2:0]

(+ 12 to - 9 dB)

HFATTEN, RX handsfree attenuator

0 to - 49 dB

RHF[2:0]

EARSENSE

0 dB

EARS[3:0]

(- 2.8 to + 3.2 dB)

Ear piece driver

6 dB

Fixed

Nominal Receive Gain

- 6.7 dB

Fixed

(Expander bypassed)

DATA and SAT Filters

TX data path filter cut-off

16 kHz

20 kHz

DATAF[1:0]

TX & RX bandpass SAT filter centre

6 kHz

Fixed

frequency

Notes:

1. Attenuation with an external de-emphasis network of series 180 k

with 10 nF to GND at RXI input.

2. Above the unaffected (0 dB gain) level the expander provides gain and below this level it attenuates

Table 24 - Receive, Data and SAT gain and filter set-ups for user control bits

ACE9040

Advance Information

Table 25 - Control Messages

OPERATING MODE

WORD/BIT

DATA 1

PREEMPH

MIS

DTMF3

DTMF2

DTMF1

DTMF0

TONEM

DTMFM

DATA 2

DTMFMODE1

DTMFMODE0

DTMFEN

MLI

TXM

DATM

SATM

RXM

DATA 3

EPH1

HIZ

RXV2

RXV1

RXV0

START-UP BIT SETTINGS

DATA 1

HEX

DATA 2

HEX

DATA 3

HEX

INITIALIZING MODE 0

WORD/BIT

DATA 1

SOFTLIMIT

SATD4

SATD3

SATD2

SATD1

SATD0

RXSEN4

DATA 2

RXSEN3

RXSEN2

RXSEN1

RXSEN0

INPS4

INPS3

INPS2

INPS1

DATA 3

INPS0

COMP2

COMP1

PDLVC

DTWIST

EPH0

START-UP BIT SETTINGS

DATA 1

HEX

DATA 2

HEX

DATA 3

HEX

INITIALIZING MODE 1

WORD/BIT

DATA 1

EARS3

EARS2

EARS1

EARS0

AUDEV3

AUDEV2

AUDEV1

AUDEV0

DATA 2

DATD3

DATD2

DATD1

DATD0

TXSEN3

TXSEN2

TXSEN1

TXSEN0

DATA 3

TACS

DATAF1

DATAF0

SATS

TEST1

TEST0

START-UP BIT SETTINGS (TACS)

DATA 1

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