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.

Author: Brat Doule
Country: Timor Leste
Language: English (Spanish)
Genre: Environment
Published (Last): 20 January 2015
Pages: 29
PDF File Size: 14.40 Mb
ePub File Size: 20.16 Mb
ISBN: 114-6-82910-203-5
Downloads: 45394
Price: Free* [*Free Regsitration Required]
Uploader: Yosho

For the K resistor, a cm8870 datasheet common value of K or K will work just fine. You could even run an electret microphone cm8870 datasheet the input and still get a valid DTMF decode by simply placing the speaker from an audio recorder next to the microphone. Using the DTMF decoder IC and a breadboard, build up the circuit as recommended in the data sheet, which cm8780 include a 3.

For testing purposes, it is much easier to feed the signal from your telephone system into the DTMF decoder so you can use the phone keypad cm8870 datasheet verify the operation of your circuit. 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 cm8870 datasheet valid DTMF signal has been decoded. cm8870 datasheet

The audio signal cm8870 datasheet processed by cm8780 robust signal processor inside the and any Cm8870 datasheet tones heard will be registered on the data output port. The input is very versatile and can be directly connected to the phone line or to any audio playback device such a computer sound card or digital recording unit.

Basically, and device capable of sending an audio signal can be fed into the DTMF decoder, and as cm8870 datasheet as the signal quality is decent, the DTMF tones can be decoded. This allows your cm8870 datasheet circuit or device to know when a number has been repeated.

Without this data receive pin, you would have no way to know if the cm8870 datasheet key has been pressed multiple times as the last cm8870 datasheet on the 4 bit output will simply remain the same. 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. 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 can cm8870 datasheet a line from the telephone jack to the to decode tones pressed on any 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.

CMC Datasheet(PDF) – California Micro Devices Corp

Cordless phones and analog cell phones that are not scrambled are particularly vulnerable as a cheap RF scanner connected to the DTMF decoder will show the listener every button pressed in real-time. Cm8870 datasheet every time a new DTMF tone has been decoded and sent to the 4 bit binary port, the data ready pin will toggle to cm8870 datasheet for a short time.

The DTMF decoder really works well on a wide range of devices. Page 2 of 7.