Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!umd5!umbc3!cbw1!brian
From: brian@cbw1.UUCP (Brian Cuthie)
Newsgroups: sci.electronics
Subject: Re: Need DTMF Decoder/Ringing Detector
Keywords: Need IC's to detect ringing and decode DTMF touch tone signals.
Message-ID: <192@cbw1.UUCP>
Date: 14 Jul 88 04:05:35 GMT
References: <5317@super.upenn.edu> <380@n3dmc.UU.NET> <1988Jul12.200218.24569@gpu.utcs.toronto.edu>
Reply-To: brian@cbw1.UMD.EDU (Brian Cuthie)
Distribution: na
Organization: CBW, Columbia, MD 21046
Lines: 17


If you're looking for a good ring detector, the best one I've seen is the
Texas Instruments TCM1520A.

As far as DTMF decoders go, there are a variety of things to be interested
in when searching for one.  If you are going to supply local dial tone then
you need one with a good dial tone reject feature (like the Teltone M957).
If you just want one that is cheap, then the SSI 202P is not a bad choice.

Hope this helps.

-brian
-- 
Brian D. Cuthie                                 uunet!umbc3!cbw1!brian
Columbia, MD                                    brian@umbc3.umd.edu
"Captain, Captain! All the stars have gone out!"
"No, you fool, you've leaned on the button.  Turn the viewer back on!"