Allegro Multimedia manual A1321, A1322, and A1323

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A1321, A1322, and A1323

Ratiometric Linear Hall Effect Sensor for High-Temperature Operation

Features and Benefits

Temperature-stable quiescent output voltage

Precise recoverability after temperature cycling

Output voltage proportional to magnetic flux density

Ratiometric rail-to-rail output

Improved sensitivity

4.5 to 5.5 V operation

Immunity to mechanical stress

Solid-state reliability

Robust EMC protection

Packages: 3 pin SOT23W (suffix LH), and 3 pin SIP (suffix UA)

Not to scale

Description

The A132X family of linear Hall-effect sensors are optimized, sensitive, and temperature-stable.These ratiometric Hall-effect sensors provide a voltage output that is proportional to the applied magnetic field. The A132X family has a quiescent output voltage that is 50% of the supply voltage and output sensitivity options of 2.5mV/G, 3.125mV/G, and 5mV/G. The features of this family of devices are ideal for use in the harsh environments found in automotive and industrial linear and rotary position sensing systems.

Each device has a BiCMOS monolithic circuit which integrates a Hall element, improved temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain amplifier, and a rail-to-rail low- impedance output stage.

A proprietary dynamic offset cancellation technique, with an internal high-frequency clock, reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. The high frequency clock allows for a greater sampling rate, which results in higher accuracy and faster signal processing capability.This technique produces devices that have an extremely stable quiescent output voltage, are immune to mechanical stress, and have precise

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Functional Block Diagram

V+

VCC

Cancellation

Dynamic Offset

Amp

Filter

Out

VOUT

0.1μF

Gain

Offset

Trim

Control

GND

A1321-DS, Rev. 10

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Contents A1321, A1322, and A1323 A1321, A1322, and A1323 Output Characteristics over VCC UA Package Characteristics Symbol Test Condition Min Typ3 Max Units4LH Package Linearity and Symmetry. The on-chip output stage Characteristic DefinitionsPieces, 3 fabrication lots Typical Characteristics575 Vcc = 5 525 Power Dissipation versus Ambient Temperature Characteristic Symbol Test Conditions Value UnitsPower Derating Package LH, 3-Pin SOT-23W Symbol Number Description Package LH Package UAPin-out Drawings Package UA, 3-Pin SIP