MSM7718-01 データシートの表示（PDF） - Oki Electric Industry

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MSM7718-01

Echo Canceler with ADPCM CODEC

Oki Electric Industry 

¡ Semiconductor

APPLICATION CIRCUIT

MSM7718

IS

IR

1 mF

Voice Analog Input (Vi)

Transmit Gain (VGSX2/Vi)

= (R2/R1) ¥ (R4/R3)

Receive Gain (VO/VVFRO)

= 2 ¥ R5/R6

Receiver Output VO

+

– 10 mF

1 mF

VDDD1,2,3

VDDA

+ SGT

– 10 mF SGR

1 mF AG

DG1,2,3

1 mF R1 R2

AIN1+

AIN1–

GSX1

1 mF R3 R4

R6 R5

AIN2

GSX2

VFRO

PWI

ZL = 120 nF + AOUT–

350 W

AOUT+

Basic

Controller

MCK

PDN/RST

PDWN

EXCK

DEN

DIN

DOUT

INT

BCLKA

SYNCA

VOXO

VOXI

PCMPCI

PCMPCO

PCMLNI

PCMLNO

PCMACI

PCMACO

PCMADI

PCMADO

BLKP

SYNCP

A20-19

A18-0

D7-0

WE

OE

RP

CS1

CS2

MSM7718-01

ADPCM

Transmit Data

ADPCM

Receive Data

ADPCM

Control

PCM

Control

37/38

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