Onboard MT8870 complex frequency decoding chip,onboard voice input interface,onboard 5 LED indicator, easy to view the output status. It is a complete DTMF receiver integrating both the bandsplit filter and digital decoder functions. After receiving the DTMF signal, it splits the signal into a high frequency band and a low frequency band, and sends the signal to the digital decoder to decode the key value, and then the solved key value is in a binary manner with four lines (Q1, Q2, Q3, Q4) output to the external shared Bus. When the MT8870 solves a button value and outputs it to the outside, its STD pin will rise from a low state to a high state, and then drop to a low state after a period of time. With this feature, when the signal is detected by this pin, , the value generated by the Q1-Q4 pin is immediately read into the CPU, and then the button value of the phone is solved. The basic chip has been the main pin leads.PCB size: 26.5 (mm) x24.5 (mm)
EAN: 0682559868852
Manufacturer: KOOBOOK
Brand: KOOBOOK
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