GENERAL DESCRIPTION

The MSM7617 cancels echoes (acoustic or line echoes) generated in voice channels. It is a lowpower CMOS LSI device with two channels.

MSM7617 echo canceling is performed by digital signal processing. It negates echoes by estimating the echo channel and then generating a pseudo-echo signal.

FEATURES

? Echo canceler has two channels, which can be used for acoustic and line echoes. Set as a single cross-connected channel, it can be used for both acoustic and line echoes.

? ITU-T G164/G165 standard tone disabler.

? PCM line level adjustment possible with SIN level attenuator (SA pin) and SOUT level amplifier (SG pin). Can also be used for ERL amplification with the SIN level attenuator (SA pin).

? RGC pin provides input/output adjustment mode (±6LR mode) that can prevent malfunction due to excessive inputs without changing the RIN-ROUT input/output levels.

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

? Echo attenuation: 30 dB (typ.)

? Clock frequency: 18 to 20 MHz 19.2 MHz if using internal clock signal

? Power supply voltage: 4.5 to 5.5 V

? Package: 64-pin plastic QFP (QFP64-P-1414-0.80-BK)

? Product name: MSM7617-001GS-BK (m-law)