DA9191A.000
July 31, 1997
APPLICATION INFORMATION
RF
IF
RX
FRONT END
DEMODULATOR
Interfaces
- DISPLAY
- KEYPAD
MAS9191A
RX VCO
AUDIO/DATA
PROCESSOR
MICRO
DUAL
DUPLEX
FILTER
VCXO
DAC
TX
CONTROLLER
SYNTHESIZER
POWER
AMP
TX VCO
MEMORY
Typical MAS9191A application in AMPS/ETACS cellular system.
TEST CIRCUIT
side tone
22nF
22nF
22nF
22nF
22nF
19
RF Modulator
16
15
13
14
11
12
4
3
2
R
C
22pF
C
R
1
18
17
57
MIC
A6
1M
4.8MHz
100nF
22nF
22pF
56
20
EXTMIC
Serial bus
micro
controller
31
32
2
R
R
C
MAS 9191A
C
side tone
A6
buzzer
100nF
100
1
48
49
27
26
A3
3
6.8
100nF
22nF
29
30
A4
earphone
IF
100nF
100nF
1nF
DTMF Receiver
34
35
36
39
40
41
42
45
46
47
EXTEARP
28
R
22nF
22nF
22nF
22nF
C
4
VDD
1
components determine the gain of microphone amplifier A6
components determine the gain of SIDETONE amplifier A2
NPN transistor for the buzzer
2
3
4
components determine RC time constant if DTMF receiver is used
34
MAS [ MICRO ANALOG SYSTEMS ]
