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)