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¡ Semiconductor

MSM7617

Symbol

Type

Description

RIN2

PCM data input pin. Pin use changes depending on the setting of the IOM

pins (refer to the block diagram).

In 2-channel parallel I/O mode, this pin becomes RIN for channel 2 and

inputs the PCM signal synchronous with SYNC2. Data is captured on the

falling edge of SCK. In other modes, this pin is not used, and should be

fixed at "L".

ROUT2

PCM data output pin. Output signal changes depending on the setting of

the IOM pins (refer to the block diagram).

Data is always output on the rising edge of SCK. This pin becomes high

impedance while there is no data.

In 2-channel parallel I/O mode, this pin becomes ROUT for channel 2 and

outputs the PCM signal synchronous with SYNC2. In 2-channel serial I/O

mode, this pin is not used and should be left open. In 1-channel cross-

connected mode, this pin becomes the cross-connected ROUT pin for

channel 2, and outputs the PCM signal synchronous with SYNC1.

SA20

SA21

S input attenuator control pins for channel 2 (refer to the block diagram).

These pins attenuate the input level of SIN. Use them if ERL is large.

The attenuation level can be set even during the echo canceler disable mode.

SG20

SG21

S output gain control pins for channel 2 (refer to the block diagram).

These pins amplify the output level of SOUT. The gain level can be set even

during the echo canceler disable mode.

SG20

Attenuation Level

0 dB

–6 dB

–12 dB

Not used

SG20

Gain Level

0 dB

+6 dB

+12 dB

Not used

SA21

SG21

PIN DESCRIPTIONS (Continued)

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