Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!hplabs!hpcc05!col!marshall
From: marshall@col.hp.com (Marshall Boss)
Newsgroups: sci.electronics
Subject: Re: Need info on DTMF decoder chips.
Message-ID: <16120023@col.hp.com>
Date: 9 Jan 91 23:22:32 GMT
References: <1991Jan6.213544.5386@techbook.com>
Organization: HP Colorado Springs Division
Lines: 11


     Try a Motorola MC145436.  It's listed in their Telecommunications 
     Device Data book on page 2-540.

     The part is a 14 pin dip.  It requires an external colorburst 
     crystal and a 1meg resistor.  All you do is pump your signal in
     one pin and you get a 4-bit binary code and a data valid signal.

     Dead easy ... Can't go wrong.

     Marshall Boss