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The filter section uses a switched capacitor technique for both high and low group filters and dial tone rejection. The CM 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 ampli-fier, 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.
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CM8870 DTMF Decoder [Original]
How IC CM8870 works as DTMF Receiver?
CM8870 DTMF Receiver & Decoder IC