[sci.electronics] Spec. needed on 8870 DTMF decoder

mckillnm@unix1.tcd.ie (Bubble Boy) (03/04/91)

Does any one know of a source book with information on the 8870
filter/decoder chip ???

                    Mark.

PS :also looking for info on the 7910 Modem chip !!

jon_sree@world.std.com (Jon Sreekanth) (03/05/91)

In article <mckillnm.668083980@unix1.tcd.ie> mckillnm@unix1.tcd.ie (Bubble Boy) writes:


   Does any one know of a source book with information on the 8870
   filter/decoder chip ???

The 8870 is a Touch Tone (tm) decoder chip, made  by Mitel, 
Teltone, SSI, and others. It is not a DTMF transciever (that is, it only 
receives and decodes DTMF, not generate them). The 8880 is a 
DTMF transciever. 

Teltone is at 800-426-3926 or 206-827-9626. If you have difficulty 
getting through, I can send you a photocopy of the spec sheet

Regards, 

/ Jon Sreekanth

Assabet Valley Microsystems			Fax and PC products
346 Lincoln St #722, Marlboro, MA 01752		508-562-0722
jon_sree@world.std.com