Revision 1.8, Preliminary

Page 1 of 19

austria

micro

systems

Key Features

Line/Speakerphone circuit on a 28-pin CMOS-IC, simple
inventory: same die for AS2523/24 and AS2523/24B

Serial I/F on AS2523, parallel I/F on AS2524

Enhanced voice switching

Background noise monitoring

Tx- and Rx-gain programmable on AS2523 only

Digital volume control of Rx signals on AS2523 only

DC characteristic programmable on AS2523 only

Dual softclipping in handset mode

Dual softclipping in handsfree mode

Loudspeaker amplifier for loudhearing and handsfree

Supply voltage generation for external circuitry

Automatic line loss compensation on AS2523 / 24B only

Real and complex impedance selectable by external
components

Side tone adaptation selectable by external components

Unique EMC performance

Operating range from 15mA to 100mA (down to 5mA
with reduced performance)

Few external components

General Description

AS2523/24 is a CMOS integrated circuit that incorporates
DC and AC line adaptation (DC-mask and synthesized AC-
impedance of 1000

) as well as a speech circuit with

softclipping, line loss compensation and Rx-volume control
for handset and handsfree operation. It shall act as an a/b-
line powered device, which is controlled by a CPU via a
serial interface on AS2523 or a standard dialler via a
parallel interface on AS2524 and AS2524B.

Applications

Enhanced handsfree feature phones with CallerID and
extended displays. The AS2524 and AS2524B are
developed to interface with common Taiwanese dialers.

Package

Available in 28-pin SOIC or die

Block Diagram

Telephone Line Interface and

Speakerphone Circuit

AS2523, AS2524, AS2524B

PRELIMINARY DATA SHEET

Data Sheet AS2523, AS2524, AS2524B

austria

micro

systems

Revision 1.8, Preliminary

Page 2 of 19

Pin description

Pin #

Symbol

Function

ine Current

ense Input

Analog input for sensing the line current

ine

nput

Analog input used for power extraction and line current sensing

eceive

nput

Analog input for ac-separated receive signal

STB

ide

one

alance Input

Analog input for side tone cancellation network

urrent

hunt Control Output

N-channel open drain output to control the external high power shunt transistor for
synthesizing AC- and DC-impedance, modulation of line voltage and shorting the line during
make periods of pulse dialing

omplex

mpedance Input

Analog input pin for the capacitor to program a complex impedance

upply

ource Control Output

N-channel open drain output to control the external high power source transistor for supplying
(Vpp) the loudspeaker amplifier in off-hook loudspeaking/handsfree mode

VSS

oltage

ource

Negative Analog Power Supply

VDD

oltage

rain

Positive Analog Power Supply

AGND

nalog

round

Special ground for the internal amplifiers

icrophone Input

Differential input for the handset microphone (electret)

icrophone Input

Differential input for the handset microphone (electret)

icrophone Input

Differential input for the handsfree microphone (electret)

icrophone Input

Differential input for the handsfree microphone (electret)

eceive

utput to

andset

Output for driving a dynamic earpiece with an impedance from 150

to 300

Data Sheet AS2523, AS2524, AS2524B

austria

micro

systems

Revision 1.8, Preliminary

Page 3 of 19

Pin #

Symbol

Function

xCS

hip

elect on AS2523

Chip select input of the serial interface. Internal pull-up resistor ( 100kOhm )

/xMUTE

Mute transmit-, receive- path and activate tone path on AS2524 and AS2524B

ata

nput on AS2523

Data input of the serial interface. Internal pull-up resistor ( 100kOhm )

/xPD

Power down mode for AS2524 and AS2524B (On-hook)

CLK

on AS2523

Clock input of the serial interface. Internal pull-up resistor ( 100kOhm )

/HFE

Handsfree mode operation on AS2524 and AS2524B

oudspeaker

utput. Output pin is for a 25

loudspeaker

FT1

Analog input pin for connecting a capacitor for offset cancellation.

TXO

Analog output of the transmit signal

TXV

Analog input for the transmit signal in the voice switching path

CBN

Analog input pin for connecting a capacitor for background noise monitoring.

RECI

Analog input for the handsfree receive path. Should be connected to RO via coupling
capacitor.

RECV

Analog input for receive voice switching path.

VSSA

Power supply pin for LO output amplifier.

VPP

Power supply pin for LO output amplifier.

TONEIN Analog input for DTMF-signals.

Data Sheet AS2523, AS2524, AS2524B

austria

micro

systems

Revision 1.8, Preliminary

Page 5 of 19

Functional Description

DC conditions

The normal operating mode is from 15mA to 100mA. An
operating mode with reduced performance is from 5mA to
15mA. In the line hold range from 0mA to 5mA the device
is in a power down mode.

The DC characteristic is determined by the voltage at LI-
pin and a 30

resistor between LI- and LS-pin. It can be

calculated by the following equation: V

= V

+ I

Line

. V

can be programmed to be 3.5V or 4.5V.

2/4 wire conversion

AS2523/24 has built in two Wheatstone bridges with one
common ground. This provides a maximum of
independence of AC-impedance and side tone from each
other. One can adapt side tone without changing the AC-
impedance.

AC-impedance

The AC-impedance of AS2523/24 is set to t.m. 1000

With the external capacitor at CI-pin it can be programmed
complex. With an external resistor of approx. 1.5k

connected to the LS-pin it can be programmed to 600

Side Tone

A good side tone cancellation can be achieved by using the
following equation:
Z

BAL

LINE

= 10

Transmit path

The gain of the M1/M2

LS is set to +37dB. This gain

can be changed by programming on AS2523 from +30dB to
+45dB in 1dB steps (Register Txgain), on AS2524 / 24B it
is set to +37dB per default. The input is differential with an
impedance of 10k

. The soft clip circuit limits the output

voltage at LS to 2V

There is LLC for this path.

The gain of the M3/M4

LS is set to +46dB.

This gain can be changed by programming from +39dB to
+54dB in 1dB steps on AS2523. The input is differential
with an impedance of 10k

. The soft clip circuit limits the

output voltage at LS to 2V

. There is no LLC for this path.

Receive path

The gain of the LS

RO receive path is set to +9dB.

This gain can be changed by programming from -6dB to
+9dB in 1dB steps (Register Rxgain). The receive input is
the differential signal of RI and STB. The soft clip circuit
limits the output voltage at RO to 1V

It prevents harsh

distortion and acoustic shock. There is LLC for this path.

The gain of the LS

LO receive path is set to +32dB.

This gain can be changed by programming from +19dB to -
34dB in 1dB steps. The user can also change the gain via
Register Handsfree receive end gain (See section
"Handsfree"). The receive input is the differential signal of
RI and STB. The soft clip circuit limits the output voltage at
LO to 1.1V

It prevents harsh distortion and acoustic

shock. There is optional LLC for this path.

Line Loss Compensation (AS2523, AS2524B)

programmable on AS2523

not activated at AS2524

permanently activated at AS2524B

When it is activated, the transmit and receive gains for
both I/O's are decreased by 6dB at line currents from
20mA to 50mA or from 45mA to 75mA.

Handsfree

The handsfree function allows voice communication without
using the handset (full 2-way speaker phone). Two voice
controlled attenuators prevent acoustic coupling between
the loudspeaker and the microphone. The voice switching
circuit has three states, namely idle, transmit or receive. In
receive mode the attenuation of the receive path and the
transmit path can be controlled by Register Handsfree
receive end gain between 0dB and -20dB. The following
table shows how voice switching is controlled

TX_atten

Backgnd

noise

monitor

Voice

switching

speech

voice switching circuit

Data Sheet AS2523, AS2524, AS2524B

austria

micro

systems

Revision 1.8, Preliminary

Page 7 of 19

Typical Characteristics of Line Loss Compensation (AS2523, AS2524B only)

The line-loss-compensation is programmable at the AS2523, not activated at the AS2524 and LLC high (45mA-75mA) activated
at the AS2524B.

Figure 1 Typical Tx Gain Characteristics Line Loss Compensation

Figure 2 Typical Rx Gain Characteristics Line Loss Compensation

f = 800 Hz
Z

LINE

= 600

= -10 dBm

(mA)

DC Line
Current

No LLC (AS2523, AS2524)

LLC high
(AS2523,AS2524B)

LLC low
(AS2523)

Tx Gain

(dB)

f = 800 Hz
Z

LINE

= 600

= -10 dBm

VOL = 0 dB (neutral)

(mA)

DC Line
Current

Rx Gain

(dB)

-2

-1

No LLC (AS2523, AS2524)

LLC high
(AS2523,AS2524B)

LLC low
(AS2523)

Data Sheet AS2523, AS2524, AS2524B

austria

micro

systems

Revision 1.8, Preliminary

Page 9 of 19

Serial interface Registers

The following table shows the content of the 16 control registers.

For a detailed description of the commands see Application note AN523/24.

Control registers AS2523

A A A A D D D D

3 2 1 0

0 0 0 0

Nop

0 0 0 1

0 0 1 0

0 0 1 1

0 1 0 0

x x x x

Conf-Tone:

0... No Conf Tone 1... Conf Tone

0111

n
f

c
1

c
0

LIV: Voltage at pin LI

0...3.5V, 1...4.5V

LLC1 LLC0: Line loss compensation setting

20mA-50mA

NO Line loss compensation

45-75mA

NO Line loss compensation

0 1 0 1

Bur

BURS: Analog tone at RO

0...OFF,

1...ON

BURL: Analog tone at LS

0...OFF,

1...ON

CT1 CT0: @RO

@LS

-36dB

-15dB

TONE-confidence level

-30dB

-9dB

rel. to pin LS

-24dB

-3dB

-18dB

+3dB

0001

0 1 1 0

x x x x

Softclip-settings, Tx_comp_gain settings

1000

t
x
_com

p_gai

n Bi

t
1

t
x
_com

p_gai

n Bi

t
0

o
ft-

Bit1 Bit0 :Tx_comp_gain

+8dB

+11dB

+14dB

+17dB

SOFTRX: Softclip RX

0...OFF,

1...ON

SOFTTX: Softclip TX

0...OFF,

1...ON

0 1 1 1

x
of

f
s
et

i
t
1

x
of

f
s
et

i
t
0

l
a
y
_
1
0
m

Bnon

Bit1 Bit0: Rx-offset setting

0mV

12mV

40mV

100mV

Delay_10ms

0... no delay

1... 10ms delay

Bnon

0... BGN off

1... BGN on

0101

1100

1 0 0 0

16 gains

Handsfree receive endgain

1111

1011

Data

RXgain

TXgain

0x0

-20dB

-30dB

Min. receive volume

0xF

+0dB

-50dB

Max. receive volume

1 0 0 1

x x x x

0000

1100

off1 off0: BGN-offset

120mV

180mV

240mV

300mV

f
1

f
0

s
1

s
0

Hfs1 HFs0: Speed of voice switching

max speed

min speed

1 0 1 0

16 gains

Transmit gain [16], 16 steps, 1dB stepsize

0111

Data

HS-mode

HF-mode

0x0

30dB

39dB

0xF

45dB

54dB

1 0 1 1

16 gains

Receive gain [16], 16 steps, 1dB stepsize

1111

Data

HS-mode

HF-mode

0x0

-6dB

19dB

0xF

+9dB

34dB

Address

Data

for AS2523,

AS2524HF

for AS2524 LH bond

option

Default value

after reset

1 1 0 0

_
o
n

e
c_on

t
e

Tone

HP_on

0... fg=200Hz

1... fg=2000Hz

rec_on :

0... Rxcomp=AGND

1... Rxcomp=RECV

Mute

0... No mute

1... Tx-path muted

Tone

0... Tx-signal path 1... Ton in signal path

0100

1000

1 1 0 1

x x x x

Mask, Lh, Hf, Hook Switch

0100

0101

Mask:

0... No mask

1... Mask acitivated

s
k

His

His

LH: Hook functions

Power down

Handset

not allowed

Handsfree

Loudhearing

1 1 1 0

x x x x

0000

0001

Test

_
r
ec

slow_rec: fast change to TX, slow change to RX, no IDLE
Krat5,Test3,Test2: For factory test only !

1 1 1 1

x x x x

Reset to defaults

Data Sheet AS2523, AS2524, AS2524B

austria

micro

systems

Revision 1.8, Preliminary

Page 10 of 19

Programming Guidelines for the AS2523

The AS2523 is programmed by means of a serial 8-bit shift
register. MSB is clocked in first, LSB last.
The first four bits (7,6,5,4) are the addresses of the
registers, the last four bits (3,2,1,0) are the data bits.

Each register has a default setting (see data sheet), which
is set after power-up of the chip.

The internal registers are RAM-cells. When the AS2523
loses VDD (as in on-hook state) it also loses the register
contents.

It is therefore necessary to re-write the affected registers
after each hook event. The register contents cannot be
read, they can only be written.

Registers need to be re-written after each power-up and
after each hook event (handset / handsfree / on-hook).

It is recommended to always initialize the chip with a "reset
to defaults command" (Fx) first and then write the
appropriate registers that need to be changed from the
default setting.

Alternatively, all registers (4 to 16) may be re-written in a
bulk at each power-up and hook event (handset /
handsfree / on-hook).

This guarantees safe operation in case of unexpected loss
of power during normal operation. Re-writing all registers
also eases later software updates, as only register
contents need to be changed, but no additional command
lines need to be inserted.

Example of a typical power-up sequence

A typical power-up sequence will require the following
programming.

a) determine the cause of power-up (handset / handsfree

mode) and set register D accordingly.
Default = handset mode

b) Set the LI voltage to 3.5V or 4.5V (default = 4.5V) and

Line Loss Compensation (default = off) in register 4

c) Set the Confidence Tone level (e.g. the DTMF level

which is audible in the handset) and path in register 5
Default = off

d) Set the required Tx and Rx gains in Registers A and B

Default = 37dB Tx gain, 1dB Rx gain

Additional settings in Handsfree mode

Note: change the default settings only if necessary:

a) A click-free startup can be achieved by starting up in

handset mode (=default) and then switching to
handsfree, once the chip has stabilized.

b) Change the Tx comparator preamplifier gain in register 6

Default = 14dB

c) Change the Receive DC offset and Background noise

monitoring in Register 7
default = 0mV offset (higher val. puts more weight on Rx)
switching delay default = on
Background Noise Monitoring = on

d) Set the speaker amplifier volume in register 8

Default = 0B

e) Set the handsfree voice switching speed and

Background Noise monitoring offset in register 9:
default voice switching speed = 1ms/6dB (fastest)
default BGN monitoring offset = 240mV (determines the
Tx level required to switch from idle to Transmit)

Additional settings during Flash

During a Flash, the AS2523 should be powered down to
avoid discharge of VDD:
Set the MASK bit (bit3 in register D) to 1
After the line current is restored, the MASK bit must be
cleared again. Other settings do not need to be re-written,
as VDD has not discharged. As a safety margin however, it
is recommended to re-write all registers after a flash

Additional settings during line breaks

If a line-break-detection (brief interruption of the line while
in off-hook state) is implemented, the same rules apply as
for a Flash: set the MASK bit to 1 to avoid discharge of
VDD. It is recommended to re-write all registers after a
line-break, as a line break may take long enough to
discharge VDD, even when the MASK bit was set.

General Rules

The serial interface may be programmed at any time, it
does not affect the speech quality, e.g. if a register is
overwritten with the same value.
It is also possible to re-write all registers periodically. The
register is static, therefore it can be clocked at any speed
up to 5MHz.
However, electromagnetic pulses on the clock and data
lines may cause unwanted programming of the chip. It is
therefore recommended to keep these lines short, filter
them by a discrete lowpass filter and reduce the clock
speed accordingly.

Data Sheet AS2523, AS2524, AS2524B

austria

micro

systems

Revision 1.8, Preliminary

Page 11 of 19

Parallel Interface on AS2524 and AS2524B

Input Signal on Pin

xPD

xMute

Mode

Power down

Tone mode

Handset mode

Handsfree mode

Power down mode

For low power consumption the analog part is turned off during activated power down mode. The Power down mode is used
during Flash and Pulse dialing and for On-hook operation.

Handset mode

Speech mode is Handset mode (M1-M2, RO active; LO deactivated)

Parameter

AS2524

AS2524B

LI Voltage

4.5V

LLC

No LLC

LLC high (45mA to 75mA)

TX-Gain

+37dB

+43dB

RX-Gain

+9dB

Rx-Softclip

Off

Tx-Softclip

Off

Tone

Off

Handsfree mode

Speech mode is Handsfree mode (M3-M4, RO active; LO active)

Parameter

AS2524

AS2524B

LI Voltage

4.5V

LLC

No LLC

LLC high (45mA to 75mA)

HF TX-Gain

+46dB

+52dB

HF RX-Gain

+34dB

Rx-Softclip

Off

Tx-Softclip

Off

Tone

Off

BNM

Data Sheet AS2523, AS2524, AS2524B

austria

micro

systems

Revision 1.8, Preliminary

Page 12 of 19

Tone mode

This mode is used to send DTMF and FSK data to the line.
Speech mode is Tone mode (M1-M2;M3-M4 muted, Rx path muted, RO and LO active)

Parameter

AS2524

AS2524B

LI Voltage

4.5V

LLC

No LLC

LLC high (45mA to 75mA)

Tone TX-Gain

+14dB

Confidence tone
level

-36dB@Ro �15dB@Lo

relative to Pin LS

-36dB@Ro �15dB@Lo

relative to Pin LS

Loudhearing AS2524 and AS2524B (feature only available as DIE)

Speech mode is Loudhearing (M3-M4, RO active; LO activated).
Loudhearing can be activated via a bond-option (see document "AS2523/24 Delivery as Dice").

Parameter

AS2524

AS2524B

LI Voltage

4.5V

LLC

No LLC

LLC high (45mA to 75mA)

TX-Gain

+37dB

+43dB

RX-Gain

+9dB

Tone

Off

Slow_rec

RECV pin

Deactivated

Highpass

2000kHz (10nF from TXO->TXV)

Voice switching speed

120ms/6dB

RX-Offset

300mV

Electrical characteristics

Electrical characteristics are measured with the Test Circuit
application. Typical mean values will not be tested.

Absolute maximum ratings

Positive Supply Voltage

-0.3V <= V

<= 7V

Input Current

+/- 25mA

Input Voltage (LS)

-0.3V <= V

<= 12V

Input Voltage (LI, CS)

-0.3V <= V

<= 8V

Input Voltage (STB, RI)

-2V <= V

<= V

+0.3V

Digital Input Voltage

-0.3V <= V

<= V

+0.3V

Electrostatic Discharge (HBM 1.5k

-100pF)

+/- 1000V

Storage Temperature

-65�C to +125�C

Recommended operating conditions

Supply Voltage (generated internally)

3V <= V

<= 5V

Operating Temperature

-25�C to +70�C

Data Sheet AS2523, AS2524, AS2524B

austria

micro

systems

Revision 1.8, Preliminary

Page 13 of 19

DC characteristics

Line

=15mA w/o operation of any additional external

circuitry, unless other specified

Symbol

Parameter

Conditions

Min

Type

Max

Units

Test

DDS

Operating Current

Speech Mode

DDH

Operating Current

Handsfree Mode

Line Voltage LIVolt=0
Line Voltage LIVolt=1

15mA<=ILINE<=100mA

3.2
4.2

3.5
4.5

3.8
4.8

V
V

Y
Y

Output Current, Sink
CS,SS

VOL=0.4V

Transmit characteristics

Line

=15mA f=800Hz, default settings unless other specified

Symbol

Parameter

Conditions

Min

Type

Max

Units

Test

M1/2TX

Transmit Gain M1/M2

AS2524
AS2524B

AC(syn)=

1000

35
39

+36.5
+42.5

38
44

dB
dB

Y
Y

M3/4TX

Transmit Gain M3/M4

AS2524
AS2524B

AC(syn)

=1000

43
49

+45.0

+51

47
53

dB
dB

Y
Y

tone TX

Transmit Gain
Tone

AC(syn)

=1000

+14dB

Variation with frequency

f = 500Hz ... 3.4kHz

�0.8

VRM12

Control range
M1/M2

16 steps

-7/+8

dBr

VRM34

Control range
M2/M4

16 steps

-7/+8

dBr

THD

Distortion

=0.25VRMS

AGC1

Soft Clip Level
M1/M2

LS at LS

AGC2

Soft Clip Level
M3/M4

LS at LS

SCO

Soft Clip Overdrive
M1/M2 - M3/M4

attack

Attack time

us/6dB

decay

Decay time

100

ms/6dB

Data Sheet AS2523, AS2524, AS2524B

austria

micro

systems

Revision 1.8, Preliminary

Page 14 of 19

Symbol

Parameter

Conditions

Min

Type

Max

Units

Test

IN-M1/2

Input Impedance
M1/M2

IN-M3/4

Input Impedance
M3/M4

INmax

Input Voltage Range
M1/2 - M3/4

differential

�1

Noise Output Voltage
LS

AMP

=25�C

Handset mode
Gain = 36.5dB

-72

dBmp

MUTE

Mute Attenuation

Mute activated

Receive characteristics

Line

=15mA f=800Hz, default settings unless other specified

Symbol

Parameter

Conditions

Min

Type

Max

Units

Test

Receive Gain
LS

AC(syn)

=1000

Vol default

7.5

10.5

LO12

Receive Gain
LS

AC(syn)

=1000

Vol maximum

+32.5

+34

+35.5

Variation with frequency

f=500Hz to 3.4kHz

�0.8

VRRO

Control range
LS

16 steps

-7/+8

dBr

VRLS

Control range
LS

16 steps

-7/+8

dBr

THD

Distortion LO

=0.25VRMS

THD

Distortion RO

=0.25VRMS

UFC

Unwanted Freq. Cmp.

f = 200 ... 20kHz

-60

dBm

AGCRO

Soft Clip Level
RO

AGCLS

Soft Clip Level
LO

1.1

SCLS

Soft Clip Overdrive
LO

attack

Attack time

us/6dB

decay

Decay time

100

ms/6dB

Data Sheet AS2523, AS2524, AS2524B

austria

micro

systems

Revision 1.8, Preliminary

Page 15 of 19

Symbol

Parameter

Conditions

Min

Type

Max

Units

Test

Noise Output Voltage
RO

AMP

=25�C

Gain = 3dB

-72

dBmp

IN-RI

INmax

Input Imp. RI
Input Voltage Range RI

�2

IN-STB

INmax

Input Imp. STB
Input Volt. Range STB

�2

Side tone

<=0.25VRMS

AC/�C

Return Loss
Temp. Variation

AC(syn)

=1000

0.5

/�C

Test circuit

VSS

R2 32R

C2
1uF

VSS

AS2523/24

25
26
27

RECI

RECV

xCS / xMUTE

DI / xPD

CLK / HFI

CBN

VPP

VSSA

VSS

STB

TONE IN

2
2

R1
600R

D1
10V

VSS

C6 100nF

R1
6k

C6 100nF

C2 1uF

BC327

D1
5V1

VSS

Vac

1
u

C6 100nF

VSS

R1
30R

C2 10uF

Vac

VSS

Vac

VSS

Q1
BC327

C6 100nF

VSS

C4 100nF

VSS

C6 100nF

Vac

150R

C1 10uF

Idc

C2
47uF

VSS

R1
300R

C7 100uF

R5
10k

R4
10k

Data Sheet AS2523, AS2524, AS2524B

austria

micro

systems

Revision 1.8, Preliminary

Page 18 of 19

Packaging

28-pin plastic SOIC
For exact mechanical package dimensions please see
austriamicrosystems

packaging information.

Pin-out, Marking

year of production

calendar week of production

AAA

austriamicrosystems

assembly ID

3 ... AS2523 Version
4 ... AS2524 Version
4B .. AS2524B Version

Ordering Information

Number

Package

Description

AS2523 T

SOIC28

plastic surface mounted
package � 28 leads

AS2524 T

SOIC28

Plastic surface mounted
package � 28 leads

AS2524B T

SOIC28

Plastic surface mounted
package � 28 leads

AS2523 F

DOF

Dice-on-Foil

AS2524 F

DOF

Dice-on-Foil

AS2524B F

DOF

Dice-on-Foil

Devices sold by austriamicrosystems AG are covered by
the warranty and patent identification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no
warranty, express, statutory, implied, or by description
regarding the information set forth herein or regarding the
freedom of the described devices from patent infringement.
austriamicrosystems AG reserves the right to change
specifications and prices at any time and without notice.
Therefore, prior to designing this product into a system, it
is necessary to check with austriamicrosystems AG for
current information. This product is intended for use in
normal commercial applications. Applications requiring
extended temperature range, unusual environmental
requirements, or high reliability applications, such as
military, medical life-support or life-sustaining equipment
are specifically not recommended without additional
processing by austriamicrosystems AG for each
application.

Copyright

Copyright � 1997-2002, austriamicrosystems AG, Schloss
Premstaetten, A8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered �. All rights reserved. The material
herein may not be reproduced, adapted, merged,
translated, stored, or used without the prior written consent
of the copyright owner.
The information furnished here by austriamicrosystems AG
is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or
any third party for any damages, including but not limited
to personal injury, property damage, loss of profits, loss of
use, interruption of business or indirect, special, incidental
or consequential damages, of any kind, in connection with
or arising out of the furnishing, performance or use of the
technical data herein. No obligation or liability to recipient
or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other
services.

YYW

AAA

AS
2
5
2
X

15 LS

16 CI

17 RO

18 VDD

19 AGND

20 RECI

21 RECV

22 VPP

23 LO

24 VSSA

25 xCS/ xMUTE

26 DI / xPD

27 CLK / HFI

28 TONE IN

SS 14

RI 13

LI 12

VSS 11

CS 10

ST B 9

M1 8

M3 7

M2 6

M4 5

TXV 4

TXO 3

FT 1 2

CBN 1

Data Sheet AS2523, AS2524, AS2524B

austria

micro

systems

Revision 1.8, Preliminary

Page 19 of 19

Contact

Headquarters

austriamicrosystems AG
Communications Business Unit
A8141 Schloss Premstaetten, Austria
T. +43 (0) 3136 500-0
F. +43 (0) 3136 500-5692

www.austriamicrosystems.com

Sales Offices

Germany

austriamicrosystems Germany GmbH
Tegernseer Landstrasse 85
D-81539 M�nchen, Germany
Phone: +49/89/693643-0
Fax: +49/89/693643-66

France

austriamicrosystems France S.a.r.l.
124, Avenue de Paris
F-94300 Vincennes, France
Phone: +33/1/43 74 00 90
Fax: +33/1/43 74 20 98

Italy

austriamicrosystems Italy S.r.l.
Via Leone Tolstoi, 64
I-20146 Milano, Italy
Phone: +39/0242/36713
Fax: +39/0242/290889

Switzerland

austriamicrosystems Switzerland AG
Rietstrasse 4
CH-8640 Rapperswil, Switzerland
Phone: +41/55/220 9000
Fax: +41/55/220 9001

USA (west)

austriamicrosystems USA, Inc.
Suite 116, 4030 Moorpark Ave,
San Jose, CA 95117, USA
Phone: +1/408/345 1790
Fax: +1/408/345 1795

USA (east)

austriamicrosystems USA, Inc.
Suite 400, 8601 Six Forks Road
Raleigh, NC 27615, USA
Phone: +1/919/676 5292
Fax: +1/919/676 5305

United Kingdom

austriamicrosystems UK, Ltd.
Coliseum Business Centre, Watchmoor Park
Camberley, Surrey, GU15 3YL, UK
Phone: +44/1276/23 3 99
Fax: +44/1276/29 3 53

Japan

austriamicrosystems AG
Shin Yokohama Daini, Center Bldg. 10F
3-19-5, Shin Yokohama
Kohoku-ku, Yokohama 222-0033, Japan
Phone: +81/45/474 0962
Fax: +81/45/472 9845

Distributors & Representatives

austriamicrosystems AG is represented by distributors in
the following countries. Please contact your nearest
regional sales office for the distributor address:

Spain, Israel, Korea, Hong-Kong, Taiwan, Malaysia,
Singapore, India, Brazil

Application Support

Please contact your local sales office or your distributor.

Электронный компонент: AS2524T