¡ Semiconductor

MSM7704-01/02/03

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¡ Semiconductor

MSM7704-01/02/03

2ch Single Rail CODEC

GENERAL DESCRIPTION

The MSM7704-01/7704-02/7704-03 are two-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 two-channel AD/DA converters in a single chip and achieve a reduced footprint and a

reduced number of external components.

The MSM7704-01/7704-02/7704-03 are best suited for an analog interface to an echo canceller

DSP used in digital telephone terminals, digital PABXs, and hands free terminals.

FEATURES

• Single power supply: +2.7 V to +3.8 V

• Power consumption

Operating mode:

30 mW Typ.

50 mW Max.

Power-saving mode:

3 mW Typ.

6 mW Max.

Power-down mode:

0.03 mW Typ.

0.3 mW Max.

• ITU-T Companding law

MSM7704-01:

m/A-law pin-selectable

MSM7704-02:

m-law

MSM7704-03:

A-law

• Built-in PLL eliminates a master clock

• The PCM interface can be switched between 2 channel serial/parallel

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

96/192/384/768/1536/1544/200 kHz

(During 2 channel serial mode, the 64 and 96 kHz clocks are disabled)

• Adjustable transmit gain

• Built-in reference voltage supply

• Analog output can directly drive a 1.2 kW load

• Package:

24-pin plastic SOP (SOP24-P-430-1.27-K) (Product name : MSM7704-01GS-K)

(Product name : MSM7704-02GS-K)

(Product name : MSM7704-03GS-K)

E2U0021-28-81

This version: Aug. 1998

Previous version: Nov. 1996