MSM7719

      This is the general description of msm7719: The MSM7719, developed for PHS (Personal Handyphone System) applications, is an LSI device and contains a line echo canceler, an acoustic echo canceler (for handsfree conversation), and a single channel full-duplex ADPCM transcoder. This MSM7719 includes DTMF tone and several types of tone generation, transmit/receive data mute and gain control, and VOX function and is best suited for PHS applications.
      And these are the features of MSM7719 : firstly, Single 5 V power supply is from 4.5 V to 5.5 V. secondly, ADPCM is ITU-T Recommendations G.726. Thirdly, PCM interface coding format is -law. Fourthly, built-in 2-channel (line and acoustic) echo canceler Line echo canceler Acoustic echo canceler (for handsfree conversation) Echo attenuation : 30 dB (typ.) ;Cancelable echo delay time : 27 ms (max.) for line echo canceler +27 ms (max.) for acoustic echo canceler Line echo canceler mode only : 54 ms (max.). Fifthly, Serial PCM/ADPCM transmission data rate is from 64 kbps to 2048 kbps. Sixthly, Low supply current when Operating mode is Typically 50 mA (VDD = 5.0 V), when Power-down mode is Typically 0.2 mA (VDD = 5.0 V). seventhly, Master clock frequency is from 9.6 to 10.0 MHz/19.2 to 20.0 MHz. eighthly, Transmit/receive mute, transmit/receive programmable gain control. Ninthly, Built-in DTMF tone generator and various tones generator. Tenthly, Control through parallel microcontroller interface and Pin control available for line and acoustic echo cancellers.
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