DA9191A.000
July 31, 1997
PIN DESCRIPTION
Pin name
Pin
Type
Function
CAMP2I
12
AI
Compressor 2nd amplifier input as well as GC4 input. Use an external
22nF capacitor between COUT and this pin.
CWCIN
13
AI
Compressor window comparator input. Use an external 22nF capacitor
between CAMP2O and this pin.
CAMP2O
COMPIN
14
15
AO
AI
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 VDD/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.
MICOUT
16
17
AO
AO
MICSGND
MIC
18
AI
MICFB
EXTMIC
XRESET
SCL
19
20
21
22
AO
AI
I
I
Serial interface clock input. The data is transferred in both directions at the
rising edge of this signal.
STB
23
I
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.
STxD
SRxD
BUZFB
BUZOUT
EXTERP
EARP1
24
25
26
27
28
29
O
I
AI
AO
AO
AO
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.
EARP2
SIDEFB
SIDETONE
30
31
32
AO
AO
AI
Side tone feedback output
Side tone input. The level of the side tone is controlled with external
components.
EINR
STGT
33
34
AI
AI
External RX input.
Steering control input for DTMF receiver. When the level at this input
changes from below VDD/2 to above VDD/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.
EST
35
36
37
AO
AI
RAUDIN
RXACCOUT
AO
3
MAS [ MICRO ANALOG SYSTEMS ]
