MSM7603 查看數據表（PDF） - Oki Electric Industry

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MSM7603

Echo Canceler

Oki Electric Industry 

¡ Semiconductor

MSM7603/7603B

PIN DESCRIPTIONS (Continued)

Pin

Symbol

Type

Description

17

GC

I

This is the pin for the input signal by which the gain controller

for the RIN input is controlled. The pin also controls RIN input

level and prevents howling.

The gain controller adjusts the RIN input level when it is –20

dBm0 or above. RIN input levels from –20 to –11.5 dBm0 will be

suppressed to –20 dBm0 in the attenuation range from 0 to 8.5 dB.

RIN input levels above –11.5 dBm0 will always be attenuated by

8.5 dB.

"H": Gain control ON

"L": Gain control OFF

"H" is recommended for performing echo cancellation.

18

SCKO

O

This is the output pin for the transmit clock signal (256 kHz) for

the PCM codec.

Connect to the SCK pin and the PCM codec transmit/receive clock

pin.

Leave open when using an external SCK.

19

ATT

I

This is the control pin for the ATT function which prevents howling

by attenuators (ATT) for the RIN input and SOUT output.

If there is input only to RIN, then the ATT for the SOUT output is

activated.

If there is no input to SIN or there is input to both SIN and RIN,

then the ATT for the RIN input is activated.

Either the ATT for the RIN output or the ATT for the SOUT is

always activated in all cases, and the attenuation of ATT is 6 dB.

"H": ATT OFF

"L": ATT ON

"L" is recommended for performing echo cancellation.

21

(TEST)

O

This pin is for MSM7603B only and not used. Should be left open.

In MSM7603 it is an NC pin.

24

RIN

I

This is the receive serial data input pin.

Input the PCM signal synchronized to SYNC and SCK.

Data is read at the falling edge of SCK.

25

SIN

I

This is the transmit serial data input pin.

Input the PCM signal synchronized to SYNC and SCK.

Data is read at the falling edge of SCK.

26

ROUT

O

This is the output pin for receive serial data.

Outputs the PCM signal synchronized to SYNC and SCK.

This pin is in high impedance state during the absence of data output.

27

SOUT

O

This is the output pin for transmit serial data.

Outputs the PCM signal synchronized to SYNC and SCK.

This pin is in high impedance state during the absence of data output.

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