The MT8870 is a complete DTMF receiver integrating both the band split 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
Specification:-
| Symbol | Parameter | Min | Max | Units |
| VDD | DC Power Supply Voltage | 7 | V | |
| VI | Voltage on any pin | VSS-0.3 | VDD+0.3 | V |
| II | Current at any pin (other than supply) | 10 | m A | |
| TSTG | Storage temperature | -65 | 150 | °C |
| PD | Package power dissipation | 500 | m W |
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