Product Summary

The MT3271BE is a high performance DTMF receiver which decodes all 16 tone pairs into a 4-bit binary code. The MT3271BE incorporates an AGC for wide dynamic range and are suitable for end-to-end signalling. The applications of the device are Integrated telephone answering machine, End-to-end signalling and Fax Machines.

Parametrics

MT3271BE absolute maximum ratings: (1)DC Power Supply Voltage, VDD-VSS: 6V; (2)Voltage on any pin (other than supply), VI/O: -0.3 to 6.3 V; (3)Current at any pin (other than supply), II/O: 10 mA; (4)Storage temperature, TS: -65 to 150℃; (5)Package power dissipation, PD: 500 mW.

Features

MT3271BE features: (1)Wide dynamic range (50dB) DTMF Receiver; (2)Call progress (CP) detection via cadence indication; (3)4-bit synchronous serial data output; (4)Software controlled guard time for MT3x70B; (5)Internal guard time circuitry for MT3x71B; (6)Powerdown option (MT317xB & MT337xB); (7)4.194304MHz crystal or ceramic resonator; (8)External clock input (MT317xB); (9)Guarantees non-detection of spurious tones.

Diagrams

MT3271BE block diagram

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