TWL1107
VOICE-BAND AUDIO PROCESSOR (VBAP
)
SLWS119 JUNE 2001
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Designed for Analog and Digital Wireless
Handsets, Voice-Enabled Terminals, and
Telecommunications Applications
D
2.7-V to 3.3-V Operation
D
Selectable 13-Bit Linear or 8-Bit A-Law
Companded Conversion
D
Differential Microphone Input with External
Gain Setting
D
Differential Earphone Output Capable of
Driving a 32-
to 8-
Load
D
Programmable Volume Control in Linear
Mode
D
Microphone (MIC) and Earphone (EAR)
Mute Functions
D
Typical Power Dissipation of 0.03 mW in
Power-Down Mode
D
2.048-MHz Master Clock Rate
D
300-Hz to 3.4-kHz Passband
D
Low Profile 20-Terminal TSSOP Packaging
description
The TWL1107 voice-band audio processor (VBAP) is designed to perform the transmit encoding
analog-to-digital (A/D) conversion, the receive decoding digital-to-analog (D/A) conversion, and the transmit
and receive filtering for voice-band communications systems. The TWL1107 device operates in either the 13-bit
linear or 8-bit companded
(
A-law) mode. The VBAP generates its own internal clocks from a 2.048-MHz master
clock input.
This device contains circuits to protect its inputs and outputs against damage due to high static voltages or electrostatic fields. These
circuits have been qualified to protect this device against electrostatic discharges (ESD) of up to 2 kV according to MIL-STD-883C,
Method 3015; however, it is advised that precautions be taken to avoid application of any voltage higher than maximum-rated
voltages to these high-impedance circuits. During storage or handling, the device leads should be shorted together or the device
should be placed in conductive foam. In a circuit, unused inputs should always be connected to an appropriated logic voltage level,
preferably either VCC or ground. Specific guidelines for handling devices of this type are contained in the publication Guidelines for
Handling Electrostatic-Discharge-Sensitive (ESDS) Devices and Assemblies available from Texas Instruments.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
VBAP is a trademark of Texas Instruments.
All other trademarks are the products of their respective owners.
Copyright
2001, Texas Instruments Incorporated
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
MICMUTE
RESET
VSS
EARVSS
EAROUT+
EARVDD
EAROUT
EARVSS
MICGAIN+
MICIN
EARMUTE
MCLK
PCMSYNC
PCMO
PCMI
DVSS
DVDD
LINSEL
MICGAIN
MICIN+
PW PACKAGE
(TOP VIEW)
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
TWL1107
VOICE-BAND AUDIO PROCESSOR (VBAP
)
SLWS119 JUNE 2001
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
functional block diagram
Analog
Modulator
TX
Filter
PCM
Interface
RX
Filter
Digital
Modulator
and Filter
RX
Volume
Control
PLL
Power
and
Reset
PCMO
PCMI
PCMSYNC
(5)
EAROUT+
RESET
EARMUTE
(20)
+
MICGAIN
(10)
MICIN +
MICGAIN +
(12)
MICIN
(11)
(9)
(17)
MCLK
LINSEL
EARVDD
EARVSS
VSS
DVSS
DVDD
EAROUT
(7)
(19)
(18)
(16)
(2)
(13)
(6)
(8)
(3)
(15)
(14)
(4)
MIC Amp 1
MICMUTE
(1)
MIC
Amp 2
EAR
AMP
RX = Receive
TX = Transmit
TWL1107
VOICE-BAND AUDIO PROCESSOR (VBAP
)
SLWS119 JUNE 2001
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description
power up/reset
An external reset must be applied to the active-low RESET terminal while MCLK is active to ensure reset at
power up.
reference
A precision band-gap reference voltage is generated internally and supplies all required references to operate
the transmit and receive channels.
phase-locked loop
The phase-locked loop generates the internal clock frequency required for internal digital filters and modulators
by phase locking to 2.048-MHz master clock input.
PCM interface
The PCM interface transmits and receives data at the PCMO and PCMI terminals respectively. The data is
transmitted or received at the MCLK speed once on each PCMSYN cycle. The PCMSYN can be driven by an
external source that is derived from the master clock and used as an interrupt to the host controller.
microphone input
The microphone input circuit consists of two differential input/differential output amplifiers (MIC Amp 1 and
MIC Amp 2). MIC Amp 1 is a low-noise differential amplifier capable of an externally set gain. MIC Amp 2 is a
differential amplifier with a fixed gain of 6 dB.
analog modulator
The transmit channel modulator is a third-order sigma-delta design.
transmit filter
The transmit filter is a digital filter designed to meet Consultive Committee on International Telegraphy and
Telephony (CCITT) G.714 requirements. The TWL1107 device operates in either the 13-bit linear or 8-bit
companded A-law mode.
receive filter
The receive (RX) filter is a digital filter that meets CCITT G.714 requirements. The TWL1107 device operates
in either the 13-bit linear or 8-bit A-law companded mode, which is selected at the LINSEL input.
receive volume control
In linear mode, the three least significant bits of the 16-bit PCMI data sample is used to control volume. The
volume range is 18 dB to 3 dB in 3-dB steps.
digital modulator and filter
The second-order digital modulator and filter convert the received digital PCM data to the analog output required
by the earphone interface.
earphone amplifiers
EAROUT is recommended for use as a differential output; however, it can be connected in single-ended
topology as well. Clicks and pops are suppressed from the differential output.
TWL1107
VOICE-BAND AUDIO PROCESSOR (VBAP
)
SLWS119 JUNE 2001
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
TERMINAL
NO.
I/O
DESCRIPTION
EARVSS
4
I
Analog ground for EAROUT+
DVDD
14
I
Digital positive power supply
DVSS
15
I
Digital negative power supply
EARMUTE
20
I
Earphone mute
EAROUT
7
O
Earphone amplifier negative output
EAROUT+
5
O
Earphone amplifier positive output
EARVDD
6
I
Analog positive power supply for the earphone amplifiers
EARVSS
8
I
Analog ground for EAROUT
LINSEL
13
I
Companding enable
MCLK
19
I
Master system clock input (2.048 MHz) (digital)
MICGAIN+
9
I
Microphone gain positive feedback
MICGAIN
12
I
Microphone gain negative feedback
MICMUTE
1
I
Microphone mute
MICIN
10
I
Microphone negative input ()
MICIN+
11
I
Microphone positive input (+)
PCMI
16
I
Receive PCM input
PCMO
17
O
Transmit PCM output
PCMSYNC
18
I
PCM frame synchronization
RESET
2
I
Active-low reset
VSS
3
I
Ground return for band-gap internal reference.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, DV
DD
, EARV
DD
0.5 V to 3.6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, V
O
0.5 V to 3.6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
0.5 V to 3.6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation
See Dissipation Rating Table
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free air temperature range, T
A
40
C to 85
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm from case for 10 seconds
260
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
DISSIPATION RATING TABLE
PACKAGE
TA
25
C
POWER RATING
DERATING FACTOR
ABOVE TA = 25
C
TA = 85
C
POWER RATING
PW
680 W
6.8 W/
C
270 W
TWL1107
VOICE-BAND AUDIO PROCESSOR (VBAP
)
SLWS119 JUNE 2001
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions (see Note 2)
MIN
NOM
MAX
UNIT
Supply voltage, DVDD, EARVDD
2.7
3.3
V
High-level input voltage, VIH
0.7 x VDD
V
Low-level input voltage, VIL
0.3 x VDD
V
Load impedance between EAROUT+ and EAROUT, RL
8 to 32
Input voltage, MICIN
0.9 x VDD
V
Operating free-air temperature, TA
40
85
_
C
NOTES:
1. To avoid possible damage and resulting reliability problems to these CMOS devices, follow the power-up sequence detailed in the
system reliability features paragraph.
2. Voltages are with respect to DVSS and EARVSS.
electrical characteristics over recommended ranges of supply voltage and operating free-air temperature
(unless otherwise noted)
supply current
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
I
Supply current from V
Operating
5
7
mA
IDD
Supply current from VDD
Power down, MCLK not present
10
30
A
tpu
Power-up time from power down
10
ms
digital interface
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VOH
High-level output voltage, PCMO
IOH = 3.2 mA,
VDD = 3 V
DVDD 0.25
V
VOL
Low-level output voltage, PCMO
IOL = 3.2 mA,
VDD = 3 V
0.2
V
IIH
High-level input current, any digital input
VI = 2.2 V to VDD
10
A
IIL
Low-level input current, any digital input
VI = 0 to 0.8 V
10
A
CI
Input capacitance
10
pF
Co
Output capacitance
20
pF
microphone interface
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIO
Input offset voltage
See Note 3
5
5
mV
IIB
Input bias current
250
250
nA
Ci
Input capacitance
5
pF
Vn
Microphone input referred noise, psophometric weighted
MIC Amp 1 gain = 23.5 dB,
See Note 4
2.9
4
Vrms
MICMUTE
80
dB
NOTES:
3. Measured while MICIN+ and MICIN are connected together. Less than 0.5 mV offset results in 0 value code on PCMOUT.
4. Configured as shown in Figure 3.
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