IC Info

In the common variety stuff there is the 8870 decoder and the 8880 encoder/decoder using 3.579MHz. Consumer Microcircuits (CML) do some exotic units, aimed at the two way radio market, that will handel DTMF.

I just bought some surface mount 8870s - beware though the MOQ was 840 ICs! It looks as if Farnell and RS both do the 8870 but not the 8880.

Alan

Hi,

Greg

datasheet

but

datasheet

but

RS (and therefore by default Farnell) have a few: RS 436-8293 and 378-3152 (the former a Philips part).

Ken

Thanks for that Greg, couldn't find the damn info myself!!!

Muchly appreciated!

Thanks Alan - I seem to be able to find no end of decoders, but the encoder/generator IC's are a tad harder, especially like the 8880 that work with the common 3.579meg xtal.... I'll keep searching and add the 8880 to my list!

Cheers

Thanks, but it seems these ones need a tad more circuitry than some of those others that have a direct input from a keypad to give a tone out (from what I could see of the 3312 datasheet)...

Trying to keep things very simple and inexpensive, hence the desire (if possible) to use an encoder chip that has the row/column direct input from a DTMF type keypad, and also uses the commonly available 3.5795MHz xtal...

Cheers

Sorry wrong one.

How many encoders are you after??

I have some PCB's with Sharp LR4087B encoders on them (and a 3.579MHz xtal). If you only need one let me know and I will stick one in the post for you with a diagram. The board already functions as a generator and has a 5v reg on it as well.

Alan Contact details in sig below

datasheet

but

Philips have the PCD3311/2 which looks like it'd do the trick. Adilam are distributors so you could try your luck.

Cheers.

Ken

Hi Alan,

Thanks for that, I have sent you a message via your site. I was primarily after just one for my setup but would also like to find out other info/availability for others, but this is less important at this stage.

Cheers