DA9191A.000
July 31, 1997
MAS9191A
Single Chip AMPS/ETACS/NAMPS Audio/Data Processor
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DESCRIPTION
The MAS9191A is a high integration BeCMOS IC for
implementing the audio and data signal processing in
AMPS, ETACS or NAMPS cellular phones. The
power consumption of the device is very low due to
several automatic and software controlled power
down modes as well as the low power characteristics
of the BeCMOS process. DTMF receiver is also
included to enable answering machine functions for
the cellular phone. Only a minimal number of
external components are needed to meet typical
baseband requirements.
Single chip solution for all audio and data processing
Low power consumption with several power down modes
SAT decoding and transponding circuitry
Simple 4-wire serial interface
FEATURES
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•
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Voice signal processing including compressor,
expander, de-emphasis and pre-emphasis filters
and digital gain adjustments
DTMF and ST generators and DTMF receiver
Busy/Idle extraction and arbitration with TX block,
voting, BCH, data buffering and framing, DCC
coding with hardware
Three 8-bit DACs and two operational amplifiers
On-chip oscillator with clock output for uP
3.3V or 5V operation with low power
consumption(RX block at 2mA/3.3V)
64-pin TQFP package, -40..85
o
C operation range
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•
APPLICATIONS
AMPS/ETACS Cellular phone
NAMPS Cellular phone
BLOCK DIAGRAM
AMPLIFIER
ANTI -
ALIASING
GAIN
CONTROL
LOWPASS
FI LTER
HIGHPASS
FI LTER
COMPRESSOR
GAIN
CONTROL
PRE-EMPHASIS
GAIN
CONTROL
LIMITER
LOWPASS
FILTER
GAIN
CONTROL
LOWPASS
FILTER
GAIN
CONTROL
LOWPASS
FILTER
MIC
GAIN
CONTROL
LOWPASS
FILTER
AMPLIFIER
TX
DTMF
Genera tor
SCL
STB
SRxD
STxD
Serial
Interface
TX
Buffer
BCH
Coding
DCC
Conversion
Framing
Manchester
coding
SAT
Generation
SIGNALLING
TONE
XSTAL1
XSTAL2
SYS1 (NAMPS)
BUSY / I DLE
COMPARATOR
BANDPASS
FILTER
SAT
Detection
SYS1 (NAMPS)
3
8-bit
DACs
AMPLIFIER
RX
Buffer
BCH
Decoding
Voting
Frame
Decoding
Manchester
Decoder
COMPARATOR
SIDETONE
AMPLIFIER
2 Utility
Operational
Amplifiers
DPLL
BUZZER
AMPLIFIER
LO WPASS
FILTER
GAIN
CONTROL
LOWPASS
FILTER
EXPANDER
BANDPASS
FILTER
DE-EMPHASI S
DTMF
Receiver
LOWPASS
FI LTER
LOWPASS
FILTER
GAIN
CONTROL
SPEAKER
RX
1
DA9191A.000
July 31, 1997
PIN CONFIGURATION
DACOUT2
DACOUT1
64
XINT
DACOUT3
CLKOUT
TXCTRL
TEST2
TEST1
XTAL1
VDD
VSS
XTAL2
TXON
BUSY
RX
ALP
62
63
60
61
58
59
56
57
54
55
52
53
50
51
49
AGND
TX
TAUDOUT
TAUDIN
LPFIN
VSAT
VDAT
TXACCIN
1
2
3
4
5
6
7
48 VREF
47 DEOUT
46 RBPFIN
45 RBPFOUT
44 VSAR
43 VDAR
42 EXPIN
41 EAMPOUT
40 EWCIN
39 EXPOUT
38 RXACCIN
37 RXACCOUT
36 RAUDIN
35 EST
34 STGT
33 EINR
8
TXACCOUT 9
PREIN
10
COUT
11
CAMP2I
12
CWCIN
CAMP20
COMPIN
MICOUT
13
14
15
16
21 XRESET
20 EXTMIC
19 MICFB
18 MIC
17 MICSGND
26 BUZFB
25 SRxD
24 STxD
23 STB
22 SCL
30 EARP1
29 EARP2
28 EXTERP
27 BUZOUT
32 SIDETONE
31 SIDEFB
TQFP64 package
PIN DESCRIPTION
Pin name
AGND
TX
TAUDOUT
TAUDIN
LPFIN
VSAT
VDAT
TXACCIN
TXACCOUT
PREIN
COUT
Pin
1
2
3
4
5
6
7
8
9
10
11
Type
AO
AO
AO
AI
AI
G
P
AI
AO
AI
AO
Function
Signal ground. The signal ground is generated internally and is equal to
V
DD
/2. The analog ground needs an external capacitor connected to
system ground.
Transmitted data signal output. Connect this output through a 22nF
capacitor to the transmitter.
TX audio output from the TX audio block..
TX audio input. The input for the TX audio signal, normally connected
through a 22nF capacitor to TAUDOUT
Input for TX limiter, lowpass filter or GC6 depending on the position of
switches S15 and S16. The pin is normally left unconnected.
Ground for TX. Connect to system ground.
Power supply for TX block. Use a bypass capacitor between pins VSAT
and VDAT.
TX block extra Op Amp input. See application note in the APPLICATIONS
section.
TX block Op Amp output.
Pre-emphasis filter input. Filter has a +6dB/octave (±1dB) frequency
response in the range 300Hz...3kHz.
Compressor output signal. The compression ratio is 2:1
2
DA9191A.000
July 31, 1997
PIN DESCRIPTION
Pin name
CAMP2I
CWCIN
CAMP2O
COMPIN
MICOUT
MICSGND
MIC
Pin
12
13
14
15
16
17
18
Type
AI
AI
AO
AI
AO
AO
AI
Function
Compressor 2nd amplifier input as well as GC4 input. Use an external
22nF capacitor between COUT and this pin.
Compressor window comparator input. Use an external 22nF capacitor
between CAMP2O and this pin.
Compressor 2nd amplifier output.
Compressor input. The input is connected through a 22nF capacitor to
MICOUT.
Microphone amplifier output. See COMPIN. This output is used as a
source for the side tone and for detection of the TX audio level.
Microphone signal ground. This is the internal signal ground V
DD
/2. If noise
appears on the microphone signal an external capacitor may be needed
between this pin and system ground.
Microphone amplifier input. Using this pin and the MICFB output the
microphone amplifier frequency response can be adjusted according to
the microphone used. The level at this input should be in the range
5..10mVrms. The maximum gain of the microphone amplifier is 30 dB.
Microphone amplifier feedback output
External microphone input. The level should be 100mVrms at 1kHz.
Master reset. Active low.
Serial interface clock input. The data is transferred in both directions at the
rising edge of this signal.
Serial interface strobe signal. With strobe signal the MAS9191A stores the
given address from the serial interface buffer and enters the data mode.
The serial interface stays in the data mode until eight SCL pulses are
received after the strobe signal.
Serial interface transmit data output.
Serial interface receive data input
Buzzer feedback is the input for the buzzer driver.
Buzzer output.
Output for external accessories
Earpiece differential outputs of earpiece amplifier. The outputs are
capable of driving a ceramic earpiece directly.
MICFB
EXTMIC
XRESET
SCL
STB
19
20
21
22
23
AO
AI
I
I
I
STxD
SRxD
BUZFB
BUZOUT
EXTERP
EARP1
EARP2
SIDEFB
SIDETONE
EINR
STGT
EST
RAUDIN
RXACCOUT
24
25
26
27
28
29
30
31
32
33
34
35
36
37
O
I
AI
AO
AO
AO
AO
AO
AI
AI
AI
AO
AI
AO
Side tone feedback output
Side tone input. The level of the side tone is controlled with external
components.
External RX input.
Steering control input for DTMF receiver. When the level at this input
changes from below V
DD
/2 to above V
DD
/2 the pin is pulled up internally.
When this occurs the DTMF tone is stored and an interrupt is generated.
Enable Steering output. This pin is high when the DTMF receiver has
detected a valid DTMF tone.
Input for filter 6. Connect through a 22nF capacitor to the expander output
(EXPOUT).
Output of uncommitted Op Amp in MAS9191A. The Op Amp is normally
used for RX audio level detection. The application circuit for this function is
in the APPLICATIONS section. Connect the level detected by the circuit
to the A/D converter of the general purpose micro controller.
3
DA9191A.000
July 31, 1997
PIN DESCRIPTION
Pin name
RXACCIN
EXPOUT
EWCIN
EAMPOUT
EXPIN
VDAR
VSAR
RBPFOUT
RBPFIN
DEOUT
VREF
RX
ALP
TEST2
TEST1
CLKOUT
TXCTRL
VSS
XTAL2
XTAL1
VDD
TXON
BUSY
XINT
DACOUT3
DACOUT2
DACOUT2
Pin
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
Type
AI
AO
AI
AO
AI
P
G
AO
AI
AO
AO
AI
AI
I
I
O
AO
G
O
I
P
O
O
O
AO
AO
AO
Function
RX block extra Op Amp input
Expander output. The expander ratio is 1:2.
Expander window comparator input. Connect a 22nF capacitor between
EWCIN and EAMPOUT.
Expander amplifier output.
Expander input. Connect a 22nF capacitor between EXPIN and
RBPFOUT.
Power supply for RX audio block. Use a bypass capacitor between VDAR
and VSAR.
Ground for RX block. Connect to system ground.
RX bandpass filter output.
RX bandpass filter input. Connect a 22nF capacitor between this pin and
DEOUT
RX de-emphasis filter output. The filter has a -6dB/octave (±1dB)
frequency response in the range 300Hz...3kHz.
Reference voltage. Connect a capacitor between this pin and system
ground.
RX input from RF. This level is 100mVrms at 1kHz.
Audio loop input. Connect through a 22nF capacitor to the TX pin.
Test input. Connect to ground during normal operation.
Test input. Connect to ground during normal operation. If connected to
V
DD
and TEST2 is connected to ground, the external clock can then be
connected to XTAL1.
4.8 MHz clock output from oscillator circuit.
Transmission control output. If a TX collision occurs this open-collector
output is set to low. The TXCTRL will remain low until the TX block is reset
with the TXRST bit or with XRESET.
Digital ground. Connect a bypass capacitor between VSS and VDD.
Crystal oscillator output.
Crystal oscillator input or external clock input if TEST1 is high and TEST2
is low.
Power supply input for digital block.
Transmission detection for debugging. This output indicates when a
transmission is occurring.
Busy/Idle output. Indicates the state of the busy/idle bit.
Active low interrupt output to micro controller. The interrupt is active until
status register 10
HEX
is read.
Output of DAC 3. The DAC output is connected to ground if the DAC is in
power down mode. The output of the DAC is controlled by register 18
HEX
.
Enter the values in two’s complement form into the DAC register.
Output of the DAC 2. The control register is located at 17
HEX
.
Output of the DAC 1. The control register is located at 16
HEX
.
4
DA9191A.000
July 31, 1997
ABSOLUTE MAXIMUM RATINGS
(GND = 0V)
Parameter
Supply voltage*
Storage temperature*
Symbol
V
DD
Ts
Conditions
Min
-55
Max
6.0
+125
Unit
V
o
C
RECOMMENDED OPERATION CONDITIONS
(GND = 0V)
Parameter
Supply voltage*
Supply current
Operating temperature*
Symbol
V
DD
I
DD
Ta
Conditions
Ta=-40...85
o
C
Ta=-40...85
o
C, V
DD
=3.3V±5%
Min
3.0
1.0
-40
Typ
3.3
2.5
Max
3.6
23
+85
Unit
V
mA
o
C
ELECTRICAL CHARACTERISTICS
◆
Digital inputs
(Ta=-40...85 C)
o
Parameter
Input high voltage*
Input low voltage*
Input leakage current
Input capacitance load*
Symbol
V
IH
V
IL
I
IL
C
I
Conditions
Min
0.7V
DD
Typ
Max
0.7V
DD
Unit
V
V
uA
pF
-10
+10
1
◆
Digital outputs
(VDD = 3.3V
±5%,
Ta=-40...85 C)
o
Parameter
Output low voltage*
Output high voltage*
Symbol
V
OL
V
OH
Conditions
XINT @ +0.4mA
XINT @ -0.4mA
Min
0.9V
DD
Typ
Max
0.1V
DD
Unit
V
V
◆
Analog inputs
(Ta=-40...85 C)
o
Parameter
External microphone level*
Microphone level*
RX input level*
* Guaranteed by design only.
Symbol
V
EXTMIC
V
MIC
V
RX
Conditions
Min
Typ
100
10
100
Max
Unit
mV
rms
mV
rms
mV
rms
5
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