Current Sensor ICs Integrate Common Mode Field Rejection

Current Sensor ICs Integrate Common Mode Field Rejection
Allegro MicroSystems Inc.

Allegro MicroSystems describes its latest current sensor ICs as economical and precise solutions for ac/dc current sensing in industrial, automotive, commercial, and communications systems. The 5V ACS724 and 3.3V ACS725 consist of a low-offset linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. The current is sensed differentially in order to reject common mode fields. Inherent accuracy is optimized through the close proximity of the magnetic field to the Hall transducer. A precise, proportional voltage is provided by the chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy after packaging. The output of the device has a positive slope when an increasing current flows through the primary copper conduction path, which is the path used for current sensing. The internal resistance of this conductive path is 1.2 mΩ typical, providing low power loss. The ACS724 and ACS725 devices are priced at $1.96 each/1,000. Datasheets are available for the ACS 724 and ACS725, respectively, at:

Allegro MicroSystems
Worcester, MA

Contact Info

Company: Allegro MicroSystems Inc.
Country: United States (USA)
Phone number: 508-853-5000
Fax: 508-853-7895

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