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 Ω + 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 and call progress tone detection

? Serial MCU interface control

? Built-in VOX control

Transmit side : Voice/silence detect

Receive side : Background noise generation at the absence of voice signal

? Built-in 2100 Hz tone detection (bidirectional)

? Package:

100-pin plastic TQFP (TQFP100-1414-0.50-K) (Product name : MSM7718-01TS-K)