ACS710KLATR View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

MFG CO.

ACS710KLATR

120 kHz Bandwidth, High-Voltage Isolation Current Sensor with Integrated Overcurrent Detection

Allegro MicroSystems 

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ACS710

120 kHz Bandwidth, High-Voltage Isolation

Current Sensor with Integrated Overcurrent Detection

Chopper Stabilization Technique

Chopper stabilization is an innovative circuit technique that is

used to minimize the offset voltage of a Hall element and an

associated on-chip amplifier. This chopper stabilization technique

nearly eliminates Hall IC output drift induced by temperature or

package stress effects. This offset reduction technique is based on

a signal modulation-demodulation process. Modulation is used

to separate the undesired DC offset signal from the magnetically

induced signal in the frequency domain. Then, using a low-pass

filter, the modulated DC offset is suppressed while the magneti-

cally induced signal passes through the filter. As a result of this

chopper stabilization approach, the output voltage from the Hall

IC is desensitized to the effects of temperature and mechanical

stress. This technique produces devices that have an extremely

stable electrical offset voltage, are immune to thermal stress, and

have precise recoverability after temperature cycling.

This technique is made possible through the use of a BiCMOS

process that allows the use of low-offset and low-noise amplifiers

in combination with high-density logic integration and sample-

and-hold circuits.

Regulator

Hall Element

Clock/Logic

Amp

Low-Pass

Filter

Concept of Chopper Stabilization Technique

Allegro MicroSystems, LLC

19

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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