MSM7718-01

E2U0052-18-86 ¡ Semiconductor MSM7718-01 ¡ Semiconductor Echo Canceler with ADPCM CODEC This version: Aug. 1998 MSM7718-01 GENERAL DESCRIPTION The MSM7718, developed for PHS (Personal Handyphone System) applications, is a CMOS LSI device and contains a line echo canceler and a single channel full-duplex ADPCM transcoder that performs interconversion between voice-band analog signal and 32 kbps ADPCM data. This device includes DTMF tone and several types of tone generation, transmit/receive data mute and gain control, and VOX function and is best suited for master telephones in PHS applications. FEATURES Single 3 V power supply VDD : 2.7 V to 3.6 V ADPCM : ITU-T Recommendations G.726 (32 kbps) Full-Duplex single channel operation Transmit/receive synchronous mode PCM interface coding format : µ -law Built-in line echo canceler Echo attenuation : 30 dB (typ.) Cancelable echo delay time : Normal speech mode : 23 ms (max.) Line echo canceler expansion mode : 54 ms (max.) Serial PCM/ADPCM transmission data rate : 64 kbps to 2048 kbps Low power consumption Operating mode : Typically 66 mW (VDD = 3.0 V) Power-down mode : Typically 0.3 mW (VDD = 3.0 V) Two analog input gain adjustable amplifier stages Analog output stage : Push-pull drive, (direct drive of 350 W + 120 nF) Master clock frequency : 9.600/19.200 MHz Transmit/receive mute, transmit/receive programmable gain control Built-in DTMF tone generator and various ringing tones generator DTMF tone ...