MSM7718-01
Overview
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.
- 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)
