Philips PM2521 Service Manual page 120

132
OQ0064
V-l
CONVERTOR
(ADC)
ST2489
Specification of inputs and outputs
Pin no.
Name
1
PROT
2
n.c.
3 D1
4 Ra
5 SI
6 Rb
7
1
8
1
9
Rb
10
S2
11 Ra
12
D2
13 Vss
14
1
in
15 Rs
16
1
ref
17
Rp
18
n.c.
19
n.c.
20 Vdd
21
n.c.
22
GND
23
Sin
24 So
Description
Protection input,
no connection
Drain input
for device
1
.
Range
a
conversion
resistor (input sensitivity 0,1V).
Source input for device
1
.
Range b conversion
resistor (input sensitivity IV).
Current output.
Current output
Range b conversion
resistor (input sensitivity IV).
Source input for device
2.
Range
a
conversion
resistor (input sensitivity 0,1V).
Drain input
for device 2.
Negative supply
voltage.
Current input.
Current
setting resistor.
Adjustment
reference current.
Current reference output.
Tc
setting resistor.
Rp determines temperature
coefficient,
no connection
no connection
Positive
supply
voltage,
no connection.
Supply Zero
^
Range
selecting input
(a
or
b).
Range
selecting reference input.
Sin
So Ra Rb
Sensitivity
ADC
0
1
X
0,1V
1 1
X
IV