OFFSET ADJUST
R
3
2
1
2
HCPL-5530
5 k Ω
I
F
-
1
220
-
U
+
Ω
U
8
7
6
5
1
2
3
4
1
+
+
I
I
C
C
3
V
I
F
IN
2
2
R
1 kΩ
4
-
U
5 k Ω GAIN ADJUST
2
-
+
50 k Ω
R
5
-15 V
-
U
+
R
R
2
2.7 k Ω
1
V
OUT
4
2.7 k Ω
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
F
´
2
I
= K
-15 V
C
2
2
Figure 13. Isolation Amplifier Application Circuit.
Description
MIL-PRF-38534 Class H, Class K, and DSCC SMD Test Program
The schematic uses a dualchannel, high-speed optocou-
pler (HCPL-5530) to function as a servo type dc isolation
amplifier. This circuit operates on the principle that two
optocouplerswilltrackeachotheriftheirgainchangesby
the same amount over a specific operating region.
Avago Technologies’s Hi-Rel Optocouplers are in compli-
ance with MIL-PRF-38534 Classes H and K. Class H and
Class K devices are also in compliance with DSCC draw-
ings 5962-87679, and 5962-90854. Testing consists of
100% screening and quality conformance inspection to
MIL-PRF-38534.
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)
For product information and a complete list of distributors, please go to our web site: www.avagotech.com
Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies, Limited in the United States and other countries.
Data subject to change. Copyright © 2007 Avago Technologies Limited. All rights reserved.
5989-1659EN - June 13, 2007
AVAGO [ AVAGO TECHNOLOGIES LIMITED ]
