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'[EE]:Any recommendation on DTMF Transmitter only, '
2005\06\23@030127 by Pang

picon face
Hi all,

Been trying to get some infor for both of these ic.
Can anyone recommend any easily available ic's that
can perform either one of the above task?

It doesn't matter if they have all of it in a single
chip or separately....

I have check out the CMX860, everything i wanted in
inside the chip, call progress, caller id, DTMF TX,
V.23 modem...., but i am afraid that it will be very
difficult to procure and cost prohibitive....

anyway, i have check out on MT8889, DTMF Tx/Rx... it
seems that they does not produce DTMF Transmitter
only, anyone know why is that? I am searchin for DTMF
Tx only, hoping that it will be cheaper than a Tx/Rx.

What about Holtek ic? Any recommendation?

Thanks a lot..and have a good day


pang

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2005\06\23@042250 by Alan B. Pearce

face picon face
>anyway, i have check out on MT8889, DTMF Tx/Rx... it
>seems that they does not produce DTMF Transmitter
>only, anyone know why is that? I am searchin for DTMF
>Tx only, hoping that it will be cheaper than a Tx/Rx.
>
>What about Holtek ic? Any recommendation?

Play with a dsPic? IIRC there is a modem library in the support package, and
the chip price cannot be that far from what you are looking at, quite
probably cheaper.

2005\06\23@081608 by Francois Robbertze

flavicon
face
For Tx only, use the Pic to generate the DTMF (microchip AN543)

For Tx/Rx, you can add a CM8870 to receive the DTMF signal save on
software...but i think the cmx624 or 680 might be a better option here

Also have a look at SM8223A & C from NIPPON PRECISION CIRCUITS INC.

what about the cid ics like the cmx602  - can receive data on and offhook

regards

Francois

> Been trying to get some infor for both of these ic.
> Can anyone recommend any easily available ic's that
> can perform either one of the above task?


2005\06\23@085721 by Alin Iliuta

picon face
TP5088    or   TT-5088
(http://www.xs4all.nl/~ganswijk/chipdir/pinusr/tt-5088.txt)
I used the second.

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