Philips PM2517E Service Manual page 63

5 8
3.4.8. OO 0064 V-l convertor (ADC)
3.4.8.1. General
The OO 0064 is an integrated Voltage to current co nvertor{ ircu it intended for use in delta modulation ADc,s.
The circuit contains a voltage to current convertor with two selectable input ranges and a precision current
reference source.
T w o E x t e r n a l i n p u t d e v i c e s a r e n e e d e d ( F E T , s ) . A s e p a r a t e i n p u t p r o t e c t i o n i s p r o v i d e d .
S o
S r n
G N D V
N C
5 v )
N . C
N C
i r e i
R s
( - 8 5 V )
I
t_
r
[ _ l
t
t
t
t
5
t
t
t
t
Fis.38.
ig
l1
T
I l
d
d
d
c
2 L
2 3
22
2 )
2 a
l 9
I 8
1 7
r 6
t 5
r 3
V s s
V d d G N o
( - 8 s v X * 8 5 v )
C U R R E N T
S O U R C E
I
ü
O U A L
VOLTÄGE TO C URRENT
C O N V E R T O R
S T 2 4 E 9