8870 DTMF IC
- DTMF receiver integrating both the bandsplit ﬁlter and digital decoder functions.
- 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.
- External component count is minimized by on chip provision of a differential input ampliﬁer, clock oscillator and latched three-state bus interface.
- Single 18-pin DIP