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.

Features

• Performance Guaranteed over Full Military Temperature Range: –55˚C to +125˚C

• Manufactured and Tested on 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