On 6 Dec 2004 at 17:21, Carey Fisher - NCS wrote:

> One of our products uses the Clare MT-8870-01SM DTMF decoder IC.
> Unfortunately, it's now out of production and I'm looking for
> a new solution.  Can anyone suggest another DTMF decoder IC?

	Look for the Holtek HT9170. It is a pin-to-pin replacement.

> I've found several papers that implement Goertzel
> filters to decode DTMF, in one case using a TI chip.
> Any comments?  And has anyone done this?  

	There is PIC DTMF decoding software available using the
Goertzel algorhitm. Any uP with an ADC can do it.
	I did it using an AVR ATMEGA8 uP.

	Mark Jordan


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