OFFSET ADJUST
R
3
2
1
2
HCPL-5530
5 kΩ
I
F
–
1
220 Ω
U
8
7
6
5
1
2
3
4
1
+
+
I
I
–
U
3
+
C
C
V
I
F
IN
2
2
R
1 kΩ
4
–
5 kΩ GAIN ADJUST
U
2
–
+
50 kΩ
R
-15 V
–
5
R
R
2
2.7 kΩ
1
U
+
V
OUT
4
2.7 kΩ
U
I
, U , U , U , LM307
1
2
3
4
2
n
1
I
I
F
F
1
I
= K
C
1
2
6 mA
CC
1
1
´
n
2
I
I
F
2
I
= K
-15 V
C
2
F
2
´
Figure 13. Isolation Amplifier Application Circuit.
Description
The schematic uses a dual-
Performance of Circuit
• 1% linearity for 10 V peak-to-
peak dynamic range
• Gain drift: -0.03%/°C
• Offset Drift: ± 1 mV/°C
• 25 kHz bandwidth (limited by
Op-Amps U1, U2)
MIL-PRF-38534 Class H,
Class K, and DESC SMD
Test Program
Hewlett-Packard’s Hi-Rel Opto-
couplers are in compliance with
MIL-PRF-38534 Classes H and K.
Class H devices are also in
channel, high-speed optocoupler
(HCPL-5530) to function as a
servo type dc isolation amplifier.
This circuit operates on the
principle that two optocouplers
will track each other if their gain
changes by the same amount over
a specific operating region.
compliance with DESC drawings
5962-87679, and 5962-90854.
Testing consists of 100% screen-
ing and quality conformance
inspection to MIL-PRF-38534.
1-570
HP [ HEWLETT-PACKARD ]
