Article View: sci.electronics
Article #20558Re: DTMF Encoding AND decoding
From: Byron A Jeff
Date: Sat, 28 Jan 1989 15:48
Date: Sat, 28 Jan 1989 15:48
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1516 bytes
In article <350@serene.UUCP> gbell@pnet12.cts.com (Greg Bell) writes: > > > > > Are there any available chips to do both encoding AND decoding of DTMF in >the same DIP? Would save some board space. Silicon Systems Inc. has such a beast. It's called the SSI 20C90 DTMF transceiver with call progress detection. It generates and receives all 16 DTMF digits, has a micro interface and an "imprecise" call progress detector. The only external components are a 3.57 Mhz "colorburst" crystal and a resistor. It's a low power CMOS part in a 22 pin DIP. The call progress detector simply activates a signal when the tone is in the 305-640 hz band. It's up to the microprocessor to figure out what the signal means. Never used one of these but it looks like a nice part. > Greg Bell_________________________________________________________ I'm in no way associated with SSI except for being a satisfied customer. BAJ -- Another random extraction from the mental bit stream of... Byron A. Jeff Georgia Tech, Atlanta GA 30332 Internet: byron@pyr.gatech.edu uucp: ...!gatech!pyr!byron
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!gatech!gitpyr!byron From: byron@pyr.gatech.EDU (Byron A Jeff) Newsgroups: sci.electronics Subject: Re: DTMF Encoding AND decoding Message-ID: <7171@pyr.gatech.EDU> Date: 28 Jan 89 15:48:36 GMT References: <350@serene.UUCP> Reply-To: byron@pyr.UUCP (Byron A Jeff) Organization: Georgia Institute of Technology Lines: 30