MAS9191A datasheet(3/36 Pages) MAS

3 / 36 page

DA9191A.000

July 31, 1997

PIN DESCRIPTION

Pin name

Type

Function

CAMP2I

Compressor 2nd amplifier input as well as GC4 input. Use an external

22nF capacitor between COUT and this pin.

CWCIN

Compressor window comparator input. Use an external 22nF capacitor

between CAMP2O and this pin.

CAMP2O

Compressor 2nd amplifier output.

COMPIN

Compressor input. The input is connected through a 22nF capacitor to

MICOUT.

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.

MICSGND

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.

MIC

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.

MICFB

Microphone amplifier feedback output

EXTMIC

External microphone input. The level should be 100mVrms at 1kHz.

XRESET

Master reset. Active low.

SCL

Serial interface clock input. The data is transferred in both directions at the

rising edge of this signal.

STB

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

Serial interface transmit data output.

SRxD

Serial interface receive data input

BUZFB

Buzzer feedback is the input for the buzzer driver.

BUZOUT

Buzzer output.

EXTERP

Output for external accessories

EARP1

Earpiece differential outputs of earpiece amplifier. The outputs are

capable of driving a ceramic earpiece directly.

EARP2

SIDEFB

Side tone feedback output

SIDETONE

Side tone input. The level of the side tone is controlled with external

components.

EINR

External RX input.

STGT

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.

EST

Enable Steering output. This pin is high when the DTMF receiver has

detected a valid DTMF tone.

RAUDIN

Input for filter 6. Connect through a 22nF capacitor to the expander output

(EXPOUT).

RXACCOUT

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.

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