Philips PM2517E Service Manual page 57

3.4.5.
OO 0060 Switching part of the ADC
3.4.5.1. General
The Oe 0060 converts the current difference from the OO 0064 (V-l convertor) to a digital output signal with
a dutytYcle depending on the input voltage of the ADC.
It generates the clock for the digital section of the PN,4 2517: this clock-frequency is determined by external
capacitors.
I
r; _
r; _
[,,
-
t',_
( - 8 . 5 v )
C L O C K
N , C
C c l o c k
[ , .
t
t _
t
C c o m p
c " o $
N C
N C
D A T A
N . C
( r 8 . 5 v )
N . C
N C
v d d
V s s G N D
+ 8 . 5 V - 8 . 5 V
c L o c K &
5 W I T C H I N G