ACE-N-6493 MT8870 DTMF Voice Decoding Module/Phone Module/Speech Decoding Voice Board Module/LED Indicators With Pins

Dual Tone Multiple Frequency technologies were introduced by Bell Labs to replace pulse-dialing in telephones. MT8870 is a DTMF Decoder module that generates a 4-bit digital code with respect to the DTMF audio signal. The MT8870 Decoder IC is integrated with an operational amplifier with user-adjustable Guard time. The embedded band-split filter uses switch capacitor techniques to distinguish and split low and high frequencies from the received signal. The module is provided with an audio jack to receive the DTMF signal generated.
A small power-efficient module requires only 5 volts for performance. In addition to mobile phones, it finds its application in a variety of embedded projects, DIY Robotics, and communication systems.