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 pushbutton 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: μ/A-law pin-selectable

MSM7705-02: μ-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 Ω 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)