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/

• 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

IDD1

VDD1

VIN+

VIN–

GND1

IDD2

VDD2

VOUT+

VOUT–

GND2

+

–

+

–

SHIELD