MSM7617 データシートの表示（PDF） - Oki Electric Industry

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MSM7617

2-Channel Echo Canceler

Oki Electric Industry 

¡ Semiconductor

MSM7617

PIN DESCRIPTIONS (Continued)

Pin

Symbol Type

Description

54

SA20

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

55

SA21

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.

SA21 SG20 Attenuation Level

0

0 0 dB

0

1 –6 dB

1

0 –12 dB

1

1 Not used

56

SG20

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

57

SG21

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

during the echo canceler disable mode.

SG21 SG20 Gain Level

0

0 0 dB

0

1 +6 dB

1

0 +12 dB

1

1 Not used

58

RIN2

I 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".

59

ROUT2

O 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.

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