The MT8870 Tone Decoder is a kind of common used multifrequency decode IC product developed by the MITEL company. It is a compete DTMF receiver. After it received the DTMF signal, it will divide the signal into high frequency group and low frequency group and send the signal to the digital decoder which can figure out the key value then send it to the outside Bus via four lines( Q1, Q2, Q3, Q4) as the binary form.
Working voltage: 5V
Power Consumption: 500MW(MAX)r: 500 mw (MAX)
On-board voice input interface
On-board LED, it is very convenient to check the output
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