MSM7718-01 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM7718-01

Echo Canceler with ADPCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7718-01

SGT, SGR

Outputs of the analog signal ground voltage.

SGT outputs the analog signal ground voltage of the transmit system, and SGR outputs the analog

signal ground voltage for the receive system. The output voltage is approximately 1.4 V. Connect

bypass capacitors of 10 mF and 0.1 mF (ceramic type) between these pins and the AG pin. However

to reduce the response time of the receiver power-on, it is recommended to apply bypass capacitors

of 1 mF and 0.1 mF. During power-down, the output changes to 0 V.

AG

Analog ground.

DG1, 2, 3

Digital ground.

VDDA

+3 V power supply for analog circuits.

VDDD1, 2, 3

+3 V power supply for digital circuits.

PDN/RST

Power-down reset control input.

A logic “0” makes the LSI device enter a power-down state. At the same time, all control register

data is reset to the initial state. Set this pin to a logic “1” during normal operating mode. Since the PDN/

RST pin is ORed with CR0-B5 of the control register, set CR0-B5 to digital “0” when using this pin.

PDWN

Power-down control input.

When set to a logic “0”, the device changes to the power-down state, but each bit of control register

and internal variables of control register are retained. During normal operation, set this pin to logic

“1”. Since the PDWN pin is ORed with CR0-B6 of the control register, set CR0-B6 to logic “0” when

using this pin.

MCK

Master clock input.

The frequency must be 9.6 MHz or 19.2 MHz. The master clock signal is allowed to be asynchronous

with SYNCP, SYNCA, BCLKP, and BCLKA.

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