Note: Product Images are shown for illustrative purposes only and may differ from the actual product. Also, another 4 Digital output(ABCD) can use “DTMF Dial” for 12-Digital outputs decode mobile and fixed telephone keys (0-9, * #).Does not require external circuits or wiring, it can be inserted directly into the UNO/MEGA2560/DUE board to use.Onboard LED lights for output state indication complete DTMF Receiver.Onboard LED, it is very convenient to check the output state.Type: MT 8870 DTMF Tone Decoding Module.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. The MT8870 Tone Decoder is a kind of commonly used multi-frequency decode IC product developed by the MITEL company.
can be written in C language and compiled using Code Vision AVR C compiler. This detection module interprets the incoming tone and produces a coded output that can be connected to all manner of microcontrollers. Components:Semiconductors:IC1 - MT8870 DTMF decoder IC2 - ATmega16 AVR. This component is ideally suited to adding dual-tone multi-frequency (DTMF) decoding to your project. Can be used to build mobile controlled robots, home automation projects, IVR style applications, etc MSAN-108 Application Note A-48 Figure 3 - MT8870 Functional Block Diagram INPUT SIGNAL VREF GS IN- IN+ VDD VSS BIAS CIRCUIT - + CHIP BIAS/POWER CHIP REF. This module is suitable for modem interfaces, mobile radios, and other DTMF-related applications. You may connect a phone to the module and the module will output the key(0-9, *, #, A, B, C, or D)pressed on the audio source. The DTMF signal in the audio source is decoded and the digital outputs on the module, indicate the key pressed. 16 CHANNELS - The control module has 16 channels, 8 kinds of selectable output function, and leads to STD signal to use as a microcontroller interrupt signal. by the ATmega16 microcontroller with the help of DTMF decoder MT8870. It can work under the temperature of -40 to 85. The module offers a 3.5mm audio connector to connect an audio source. HIGH QUALITY - The audio decoder module is made of high quality material and can last long service life. The embedded band-split filter uses switch capacitor techniques to distinguish and split low and high frequencies from the received signal. The MT8870 Decoder IC is integrated with an operational amplifier with user-adjustable Guard time. MT8870 DTMF Decoder Module is a very tiny module that is based on MT8870 DTMF decoder ic. MT8870 is a DTMF Decoder module that generates a 4-bit digital code with respect to the DTMF audio signal.