CF8223A View Datasheet(PDF) - Nippon Precision Circuits
Part Name
Description
MFG CO.
'CF8223A' PDF : 15 Pages View PDF
SM8223A
VRIG
VDD
0.7VDD
VSS
0.3VDD
Point a Signal
VRIG
VDD
0.7VDD
VSS
0.3VDD
Point b Signal
VDD
0.7VDD
VSS
0.3VDD
Point c Signal
VDD
0.7VDD
VSS
0.3VDD
Point d Signal
Figure 2. Ring signal detector circuit waveform transitions
The voltage divider level and RC time constant are
given by the following equations, respectively.
0.7V DD
=
--------------R---1---------------
R1 + R2 + R3
⋅
V
RIG
C1R4=
------------------t-------------------
I
n
V-----D--V--D---D--–--D---V----T--
where t is the guard time, and the trigger level satis-
fies the expression 0.3VDD ≤ VT ≤ 0.7VDD.
NIPPON PRECISION CIRCUITS—10
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