CM Datasheet, CM PDF, CM Data sheet, CM manual, CM pdf, CM, datenblatt, Electronics CM, alldatasheet, free, datasheet. CM CMOS Integrated DTMF Receiver. Features. Full DTMF receiver Less than 35mW power consumption Industrial temperature range Uses quartz crystal . CM/70C. CMOS Integrated DTMF Receiver Features • Full DTMF receiver • Less than 35mW power consumption • Industrial temperature range • Uses.

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California Micro Devices Corp – datasheet pdf

Cm8870 datasheet allows your receiving circuit or device to know when a number has been repeated. The audio signal is processed by a robust datashewt processor inside the and any DTMF tones heard will be registered on the data output port. cm8870 datasheet

Cordless cm8870 datasheet and analog cell phones that are not scrambled are particularly vulnerable as a cheap RF cm8870 datasheet connected to the DTMF decoder will show the listener every button pressed in real-time. Page 2 of 7. Basically, and device capable of sending an audio signal can be fed into the DTMF decoder, and as long as the signal quality is decent, the DTMF tones can be decoded.


The input is very versatile and can be directly connected to the phone cm8870 datasheet or to any audio playback device such a computer sound card or digital recording unit. So every cm8870 datasheet a new Dqtasheet tone has been decoded and sent to the 4 bit binary port, the data ready pin will toggle to high for a short time.

You can feed a line from the telephone jack to the to decode tones pressed on cm8870 datasheet phone on the same line, or you can feed the output from some audio source such as an RF scanner, digital recorder or computer sound card directly into the DTMF decoder. Without this data receive pin, you would have no way to know if the same key has been pressed multiple times as the cm8870 datasheet data on the 4 bit output will cm8870 datasheet remain the same.

The DTMF decoder really works well on a wide range of devices.

cm8870 datasheet Using the Cm8870 datasheet decoder IC and a breadboard, build up the circuit as recommended in the data sheet, which will dagasheet a 3. This setup allows a wide range of audio devices to be fed into the input without having to worry about impedance matching or the level of the output.


For testing purposes, it dataasheet much easier to feed the signal from your telephone system into the Cm8870 datasheet decoder so you cm8870 datasheet use the phone keypad to verify the operation of your circuit. To get DTMF data into the decoder chip, pins 1, 2, 3, and 4 are set up as an analog input as shown in the datasheet example.

You could even run an electret microphone into the input and still cm8870 datasheet a valid DTMF decode by simply placing the speaker from dataseet audio recorder next to the microphone.

cm8870 datasheet There are actually five output pins used on the decoder – four of them represent the binary data and a 5th pin toggles from low to high and then back to low every time a valid DTMF signal has been decoded. For the K resistor, cm8870 datasheet more common value of K or K will work just fine.