Philips PM2517E - Page 63

58
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.
Two External
input
devices
are needed
(FET,s).
A separate
input
protection
is
provided.
So
Srn
GNDV
NC
5v)
N.C
NC
irei
Rs
(-8
5V)
I
t_
r
[_l
t
t
t
t
5
t
t
t
t
Fis.38.
ig
l1
T
Il
d
d
d
c
J
2L
23
22
2)
2a
l9
I8
17
r6
t5
r3
Vss
Vdd
GNo
(-8svX*85v)
CURRENT
SOURCE
I
ü
OUAL
VOLTÄGE
TO
C URRENT
CONVERTOR
ST24 E9