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MT8870/CM8870 DTMF Receiver & Decoder

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The CAMD CM8870/70C provides full DTMF receiver capability by integrating both the band-split filter and digital decoder functions into a single 18-pin DIP package. The CM8870/70C is manufactured using state-of-the-art CMOS process technology for low power consumption (35mW, MAX) and precise data handling. The filter section uses a switched capacitor technique for both high and low group filters and dial tone rejection. The CM8870/70C decoder uses digital counting techniques for the detection and decoding of all 16 DTMF tone pairs into a 4-bit code. This DTMF receiver minimizes external component count by providing an on-chip differential input amplifier, clock generator, and a latched three-state interface bus. The on-chip clock generator requires only a low cost TV crystal or ceramic resonator as an external component.

Features:

  • Full DTMF receiver
  • Less than 35mW power consumption
  • Industrial temperature range
  • Uses quartz crystal or ceramic resonators
  • Adjustable acquisition and release times
  • 18-pin DIP
 

Applications:

  • PABX
  • Central office
  • Mobile radio
  • Remote control
  • Remote data entry
  • Call limiting
  • Telephone answering systems
  • Paging systems
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