Very simple question 2

Z

zambalik

New Member

• Jul 11, 2003

• #1

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

 

Sebi

Active Member

• Jul 11, 2003

• #2

The DTMF decoder working in sound frequecy range, after picking up.

 

Z

zambalik

New Member

• Jul 11, 2003

• #3

i didn't get u
does this mean it won't decode untill i pick up the phone ?

 

Y

Yatin

New Member

• Jul 17, 2004

• #4

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