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CMOS Integrated DTMF Receiver
CM8870PI is a DTMF receiver integrated circuit (IC) manufactured by CMD. It is a dual-tone multi-frequency (DTMF) receiver that is used to detect and decode DTMF tones from a telephone line. Description: The CM8870PI is a full DTMF receiver that integrates both the band-split filter and digital decoder functions into a single 18-pin DIP package. It has a built-in clock generator and a power-down mode. The filter section uses switched capacitor techniques for high and low group filters; the decoder uses digital counting techniques to detect and decode all 16 DTMF tone pairs into a 4-bit code. Features: * Low power consumption * Low external component count * High immunity to noise * Built-in clock generator * Power-down mode * TTL and CMOS compatible Applications: * Touch tone dialing * Telephone answering machines * Remote control systems * Security systems * Voice mail systems (For reference only)