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