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DTMF DECODER

INTERFACE BRDS






DTMF Decoder


Decodes DTMF audio signal to 4 bit binary TTL level output with LED indication. Suitable for use with microcontroller applications.


Features
Decodes DTMF as 4 bit binary
TTL level output for direct connection to microcontrollers
Low power 5V DC operation
LED indication of outputs
Simple to use
Based on excellent MT8870 IC

Applications

Remote Control systems
Caller ID applications
FM receiver based remote control
Remote control using Mobile phone

Specification

Operating Voltage 5 V DC Regulated power supply input
Operating Current 100 mA

Information

Connect regulated +5V DC supply for operation of board. Outputs Q1-4 and VT are active highoutput at 5V level. If any LED is on means that output is at high level. VT LED blinks once a new DTMF tone is received. The binary data appears at Q1 to Q4. Details of this output is on next page.Input signal can be from an audio source like microphone amplifier, FM radio receiver, wired phone line. Please note when connecting land line phone signal, do not connect ground wire of board to phone line directly. Use a 100nF capacitor in series to phone line wires at ground.







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