MT8870 Complete DTMF Receiver

A fully-integrated DTMF receiver with low power consumption and high performance

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. It is backward compatible with MT8870C/MT8870C-1.

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

• DC Power Supply Voltage (VDD): 7 V
• Voltage on any pin (VI): VSS-0.3 to VDD+0.3 V
• Current at any pin (II): 10 mA
• Storage temperature (TSTG): -65 to 150 C
• Package power dissipation (PD): 500 mW

Related Document: MT8870 IC Data Sheet