DTMF MT8870 Audio Decoder Module
DTMF (Dual Tone Multi-Frequency) is a telecommunications signaling method that uses a combination of two sinusoidal frequencies to generate a dial tone.
The MT8870 module is a DTMF receiver that decodes the key pressed on a telephone keypad using a band-split filter. A band-split filter, as the name implies, splits the consolidated frequencies to identify them. The MT8870 module then converts the DTMF signal into 4-bit digital representing all 16 possible combinations on a standard telephone keypad.
- Operating Voltage: 5V
- Interface type: Digital
- On-board MT8870 frequency decoder chip
- On-board audio input interface
- On-board LED lights for output state indication
- PCB Size: 26.5 x 24.5 mm
- DTMF decoder module x1