¡ Semiconductor

MSM7705-01/02/03

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¡ Semiconductor

MSM7705-01/02/03

4ch Single Rail CODEC

GENERAL DESCRIPTION

The MSM7705-01/02/03 are four-channel CODEC CMOS ICs for voice signals ranging from 300

to 3400 Hz. These devices contain filters for A/D and D/A conversion.

Designed especially for a single-power supply and low-power applications, these devices

contain four-channel A/D and D/A converters in a single chip and achieve a reduced footprint

and a reduced number of external components.

The MSM7705-01/02/03 are best suited for digital telephone terminals, digital PABXs, and push-

button phones.

FEATURES

• Single power supply: +5 V

• Power consumption

Operating mode:

70 mW Typ.

140 mW Max.

Power-saving mode:

14 mW Typ.

32 mW Max.

Power-down mode:

0.05 mW Typ.

0.3 mW Max.

• Conforms to ITU-T Companding law

MSM7705-01:

m/A-law pin-selectable

MSM7705-02:

m-law

MSM7705-03:

A-law

• Built-in PLL eliminates a master clock

• The PCM interface can be switched between 4 channel serial/parallel

• Transmission clock: 64/128/256/512/1024/2048 kHz

96/192/384/768/1536/1544 kHz

(During 4 channel serial mode, the 64, 96, 128, and 192 kHz clocks are

disabled)

• Transmit gain adjustable for each channel

• Built-in reference voltage supply

• Analog output can directly drive a 600 W line transformer

• Package:

44-pin plastic QFP (QFP44-P-910-0.80-2K) (Product name : MSM7705-01GS-2K)

(Product name : MSM7705-02GS-2K)

(Product name : MSM7705-03GS-2K)

E2U0042-28-81

This version: Aug. 1998

Previous version: Nov. 1996