For example, the key 1 produces a superimposition of tones of 6 hertz (Hz). Pressing a single key sends a sinusoidal tone for each of the two frequencies. The DTMF receiver is based upon the industry standard MT8870 monolithic DTMF receiver the transmitter utilizes a switched capacitor D/A converter for low distortion and high accuracy DTMF signaling. The DTMF keypad is a 4x4 matrix in which each row represents a low frequency and each column represents a high frequency.
It is ISO2-CMOS technology, which provides low power dissipation and high reliability. Mouser offers inventory, pricing, & datasheets for. The MT8880/C-1 is a monolithic DTMF transceiver with a call progress filter. DTMF - Dual-tone Multi-frequency Receivers Telecom Interface ICs are available at Mouser Electronics.
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