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Very simple question 2

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zambalik

New Member
hi
i am using IC HT 8870 as a DTMF to BCD decoder.
the question is when does this IC starts decoding, after picking up the phone or before while ringing ?
thanx
 

Yatin

New Member
Really simple !

The IC starts decoding when a valid tone pair is present on it's i/p
B T W i would like to know the proper R/C values as my 100k,100k,300k,0.1uc values do not show me data at all,even on StD pin


Thanx
Yatin
 
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