Hermetically Sealed Analog
Isolation Amplifier
Technical Data
HCPL-7850
HCPL-7851
5962-97557
Features
• Performance Guaranteed
over Full Military
Temperature Range: –55˚C
to +125˚C
• Manufactured and Tested on
a MIL-PRF-38534 Certified
Line
• Hermetically Sealed
Packages
• Dual Marked with Device
Part Number and DSCC
Drawing Number
• QML-38534, Class H
• HCPL-7840 Function
Compatibility
• High Common Mode
Rejection (CMR):
8 kV/µs at VCM = 1000 V
• 5% Gain Tolerance
• 0.1% Nonlinearity
• Low Offset Voltage and
Offset Temperature
Coefficient
• 100 kHz Bandwidth
Applications
• Industrial and Military
• High Reliability Systems
• Harsh Industrial
Environments
• Transportation, Medical,
and Life Critical Systems
• General Purpose Analog
Signal Isolation
• Motor Phase and Rail
Current Sensing
• Inverter Current Sensing
• Switched Mode Power
Supply Signal Isolation
• General Purpose Current
Sensing and Monitoring
Description
The HCPL-7850/7851 is an
isolation amplifier that provides
accurate, electrically isolated and
amplified representations of
voltage and current. When used
with a shunt resistor to monitor
the motor phase current in a high
speed motor drive, the device will
offer superior reliability
compared with the traditional
solutions such as current
transformers and Hall-effect
sensors. The HCPL-7850/7851
consists of a sigma-delta analog-
to-digital converter optically
coupled to a digital-to-analog
converter in a hermetically sealed
package. The products are
capable of operation and storage
over the full military temperature
range and can be purchased as
either commercial product or
with full MIL-PRF-38534 Class H
testing or from the appropriate
DSCC drawing. All devices are
manufactured and tested on a
MIL-PRF-38534 certified line and
are included in the DSCC
Qualified Manufacturers List,
QML-38534 for Hybrid
Microcircuits.
Schematic Diagram
A 0.1 F bypass capacitor must be connected between pins 1 and 4 and between pins 5 and 8.
CAUTION: It is advised that normal static precautions be taken in handling and assembly of this
component to prevent damage and/or degradation which may be induced by ESD.
1
2
3
4
8
7
6
5
I
DD1
V
DD1
V
IN+
V
IN–
GND1
I
DD2
V
DD2
V
OUT+
V
OUT–
GND2
+
–
+
–
SHIELD