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MSM7581

ITU-T G.721 4ch ADPCM TRANSCODER

Oki Electric Industry 

E2U0032-28-82

¡ ¡ SemicondSucetormiconductor

MSM7581

ITU-T G.721 4ch ADPCM TRANSCODER

This version: AMugS.M19795881

Previous version: Nov. 1996

GENERAL DESCRIPTION

The MSM7581 is an ADPCM transcoder which is used by the new digital cordless system.

It converts 64 kbps voice PCM serial data to 32 kbps ITU-T G.721 ADPCM serial data, and vice

versa.

This device is consists of four systems with full-duplex voice data channels and a data-through

mode.

The MSM7581 provides cost effective solutions for digital cordless office telephone systems

which are incorporated into PABXs, and for the public base stations which are connected to the

Central Office through digital PSTNs.

FEATURES

• Conforms to ITU-T G.721

• Built-in Full-duplex Transcoder with Four Data Channels

• PCM companding Law: A-law/µ-law selectable

• Serial PCM Data Transmission Speed: 64 kbps to 2048 kbps

• Serial ADPCM Data Transmission Speed: 32 kbps to 2048 kbps

• Hardware Reset – ITU-T G.721 Optional Reset – for each channel

• Power Down Control for each channel

• Decoder (ADPCM Æ PCM ) Mute Mode and PAD Mode for each channel

• ADPCM Data-through Mode

• Capable of time slot conversion

• Special ADPCM Input Data Code (”0000”) Detector for each channel

• Master Clock Signal : Not necessary

• Power supply voltage/Consumption current :

+2.7 V to +5.5 V, 2 mA/channel (max)

• Package :

100-pin plastic TQFP (TQFP100-P-1414-0.50-K) (Product name : MSM7581TS-K)

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