A1120LUA-T【PDF 1/18 页】IC SW HALL EFFECT CHOPPER 3-SIP

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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癈. Superior high-

temperature 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. Each package type is lead (Pb) free

(suffix, T), with a 100% matte tin plated leadframe.

A1120-DS, Rev. 15

Features and Benefits

? Unipolar switchpoints

? Resistant to physical stress

? Superior temperature stability

? Output short-circuit protection

? Operation from unregulated supply

? Reverse battery protection

? Solid-state reliability

? Small package sizes

Chopper Stabilized Precision Hall Effect Switches

Packages:

Functional Block Diagram

Not to scale

A1120, A1121, A1122, A1123, and A1125

3-pin SOT23W

(suffix LH)

(A1121, A1122,

A1123, and A1125)

(A1120)

3-pin SIP (suffix UA)

Regulator

GND

VCC

VOUT

Control

Current Limit

To All Subcircuits

Amp

Low-Pass

Filter

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