GENERAL DESCRIPTION

The MSM7603/7603B is an improved version of the MSM7602 with basically the same configuration, and offers twice the cancelable echo delay time of the MSM7602.

The MSM7603B I/O interface allows switching between m-law PCM and A-law PCM.

The MSM7603/7603B is a low-power CMOS IC device for canceling echo (in an acoustic system or telephone line) generated in a speech path.

Echo is canceled, in digital signal processing, by estimating the echo path and generating a pseudo echo signal.

FEATURES

? Can handle both acoustic and telephone line echoes.

? Switchable between m-law PCM and A-law PCM interfaces. (MSM7603B)

? Cancelable echo delay time: MSM7603B-003 .............. 55 ms (max.)

? Echo attenuation : 30 dB (typ.)

? Clock frequency : 19.2 MHz

17.5 MHz to 20 MHz (when internal sync signal not used)

? Power supply voltage : 2.7 V to 5.5 V

? Package:

28-pin plastic SSOP (SSOP28-P-485-0.65-K) (Product name : MSM7603-003GS-K)

(Product name : MSM7603B-003GS-K)