MAS9191A Просмотр технического описания (PDF) - Micro Analog systems
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MAS9191A Datasheet PDF : 36 Pages
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PIN DESCRIPTION
Pin name
Pin
CAMP2I
12
CWCIN
13
CAMP2O
14
COMPIN
15
MICOUT
16
MICSGND
17
MIC
18
MICFB
19
EXTMIC
20
XRESET
21
SCL
22
STB
23
STxD
24
SRxD
25
BUZFB
26
BUZOUT
27
EXTERP
28
EARP1
29
EARP2
30
SIDEFB
31
SIDETONE
32
EINR
33
STGT
34
EST
35
RAUDIN
36
RXACCOUT
37
DA9191A.000
July 31, 1997
Type
AI
AI
AO
AI
AO
AO
AI
AO
AI
I
I
I
O
I
AI
AO
AO
AO
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 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.
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.
AO
AO Side tone feedback output
AI Side tone input. The level of the side tone is controlled with external
components.
AI External RX input.
AI 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.
AO Enable Steering output. This pin is high when the DTMF receiver has
detected a valid DTMF tone.
AI Input for filter 6. Connect through a 22nF capacitor to the expander output
(EXPOUT).
AO 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
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