3

A1421-DS

Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

High Precision Hall Effect AC-Coupled Differential Sensor with Integrated Filter Capacitor

A1421, A1422, A1423

Functional Block Diagram

Hall

Amp

Regulator

Bandpass Filter Integrated

Tracking Capacitor

VOUT

(Pin 2)

VCC

(Pin 1)

GND

(Pin 4)

0.1 uF

V

Diagnostic

Circuitry

Gain

Stage

Dual Hall

Transducers

Comparator

TEST

(Pin 3)

(Required)

V

REF