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A1122

Allegro
Part Number A1122
Manufacturer Allegro
Description Chopper-Stabilized Precision Hall-Effect Switches
Published Dec 21, 2012
Detailed Description A1120, A1121, A1122, A1123, and A1125 Chopper-Stabilized Precision Hall-Effect Switches FEATURES AND BENEFITS ▪ AEC-Q10...
Datasheet PDF File A1122 PDF File

A1122
A1122

Overview
A1120, A1121, A1122, A1123, and A1125 Chopper-Stabilized Precision Hall-Effect Switches FEATURES AND BENEFITS ▪ AEC-Q100 automotive qualified ▪ Unipolar switch points ▪ Resistant to physical stress ▪ Superior temperature stability ▪ Output short-circuit protection ▪ Operation from unregulated supply ▪ Reverse-battery protection ▪ Solid-state reliability ▪ Small package sizes PACKAGES: Not to scale 3-pin SOT23W (suffix LH) NOT FOR NEW DESIGN 3-pin SIP, matrix HD style (suffix UA) 3-pin SIP, chopper style (suffix UA) DESCRIPTION The A1120, A1121, A1122, A1123, and A1125 Hall-effect unipolar switches are extremely temperature-stable and stress-resistant sensor ICs, especially suited for operation over extended temperature ranges to 150°C.
Superior hightemperature performance is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress.
Each device includes on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit protected open-drain output to sink up to 25 mA.
An on-board regulator permits operation with supply voltages of 3 to 24 V.
The advantage of operating down to 3 V is that the device can be used in 3 V applications or with additional external resistance in series with the supply pin for greater protection against high-voltage transient events.
For the A1120, A1121, A1122, and A1123, a south pole of sufficient strength turns the output on.
Removal of the magnetic field turns the output off.
The A1125 is complementary, in that for these devices, a south pole turns the A1125 output off, and removal of the magnetic field turns the output on.
Two package styles provide a magnetically optimized package for most applications.
Package type LH is a modified SOT23W, surface-mount package, while UA is a three-lead ultra-mini SIP for through-hole mounting.
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