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MSM7540

Single Rail ADPCM CODEC

Oki Electric Industry 

E2U0026-28-83

¡ ¡ SemicondSucetormiconductor

MSM7540/7560

Single Rail ADPCM CODEC

This versiMonS:MA7u5g4.01/9795860

Previous version: Nov. 1996

GENERAL DESCRIPTION

The MSM7540/7560 are single channel ADPCM CODEC ICs which perform mutual transcoding

between an analog voice band signal 300 to 3400 Hz and 32 kbps ADPCM serial data.

Using advanced circuit technology, these devices operate using a single 5 V power supply and

have low power consumption.

The MSM7540/7560 are optimized for advanced digital cordless telephone system applications.

FEATURES

• Single 5 V Power Supply Operation

• ADPCM Algorithm :

Complies completely with 1988's version ITU-T

G.721 (32 kbps)

• Transmit/Receive Full-Duplex Operation

• Transmit/Receive Synchronous Mode Only

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

• Serial PCM Transmission Data Rate :

64 kbps to 2048 kbps

• PCM Interface Coding Format

MSM7540 :

A-law or Linear (14-bit, 2's compliment) Selectable

MSM7560 :

m-law or Linear (14-bit, 2's compliment) Selectable

• Low Power Consumption

Operating Mode :

60 mW Typ.

Power-Down Mode :

1.0 mW Typ.

• Two Analog Input Amplifier Stages :

Externally Adjustable Gain

• Analog Output Stage :

Push-pull Drive (direct drive of 350 W␣ + 120 nF)

• Built-in Crystal Oscillator (10.368 MHz)

• Built-in Reference Voltage Supply

• Option Reset Specified by ITU-T G. 721/ADPCM

• Package:

28-pin plastic SOP (SOP28-P-430-1.27-K) (Product name: MSM7540GS-K)

(Product name: MSM7560GS-K)

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