MT8870 - DTMF Decoder

The MT8870 is a complete 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.

Features:-

• Complete DTMF Receiver 
• Low power consumption 
• Internal gain setting amplifier 
• Adjustable guard time 
• Central office quality 
• Power-down mode 
• Inhibit mode 
• Backward compatible with MT8870C/MT8870C-1