CM8870 DTMF DECODER DATASHEET PDF

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MTDSR 18 Pin SOIC*. Tape & Reel. *Pb Free Matte Tin. °C to +85°C. MTD/MTD ISO. 2. -CMOS Integrated DTMF Receiver. Data Sheet. The M is a full DTMF Receiver that integrates both bandsplit filter and decoder functions into a single pin DIP or SOIC package. Manufactured using . cm dtmf decoder datasheet, cross reference, circuit and application notes in pdf format.

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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. You May Also Like: Thank you once again. When new tone is detected, another set of output will be high. Thank you so much. Also, see the datasheet for wiring of your amplifier. Using the DTMF decoder IC and a breadboard, build up the circuit as recommended in the data sheet, which will include a 3.

Page 2 of 7. August 25, Yes, my password is: 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.

I have made my own way of communicating with it, using the tones to send weighted binary data. You could even run an electret microphone into the input and still get a valid DTMF decode by simply placing the speaker from an audio recorder next to the microphone. For the K resistor, a more common value of K or K will work just fine. See the equation for the Basic Steering Circuit on page 3 and for gaurd time adjustment on figure 5 of the datasheet. I have connected the circuit as shown in the attachment.

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I’m pretty sure the 4-bit output buffer in the IC just changes from one binary state to the next, so it does not go to “zero” between changes.

Please reply as soon as possible Last edited by a moderator: 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.

I can’t see the latch update logic being complex enough deal with individual outputs as being same or different, for the period tpStD that the cm870 sheet has down as an ‘indeterminate’ latch state Datasheeh are fairly simple.

California Micro Devices Corp

But do connect pin 10 to logic high to enable the internal pull-ups. Your name or email address: Just connect the pull down resistors as in the schematic in the first post in this thread.

If one output pin is same in both output combinations, will it turned off momentarily and then turn on again or will it remain latched until new combination is active? Aug 30, 1, Logged Victor Beginner Posts: Do you already have an dtmt

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California Micro Devices Corp – datasheet pdf

Engineering is based on numbers – not adjectives angad Jr. Admin Administrator Supreme Robot Posts: A lot of things can be done with the chip! Now it’s a K resistor.

Feb 22, 1. Jan 11, 2. Nothing much, just wanted to share my knowledge. April 29, How should we be able to, when you post absolutely no info on what you’ve done, no schematic with component values and no nothing at all? On the right hand side the daasheet and capacitor are chosen to set up the time ms to detect phone rings. Then look up the equation for the op-amp and solve for the 2 decoxer and capacitors.

But you can google it. Increasing the value of GS resistor solved the problem.