A1250LUA-T Allegro Micro Systems, Inc., A1250LUA-T Datasheet

A1250LUA-T

Manufacturer Part Number

A1250LUA-T

Description

Manufacturer

Allegro Micro Systems, Inc.

Datasheet

1.A1250LUA-T.pdf (12 pages)

Specifications of A1250LUA-T

Pack_quantity

500

Comm_code

85415000

Lead_time

175

Current page: 1 of 12
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Features and Benefits

• High speed, 4-phase chopper stabilization

• Low operating voltage down to 3.0 V

• High Sensitivity

• Stable switchpoints

• Robust EMC

Packages: 3-pin SOT23W (suffix LH), and

A1250-DS, Rev. 1

3-pin SIP (suffix UA)

Not to scale

V+

Clock / Logic

Functional Block Diagram

Amp

Regulator

Hall Effect Latch / Bipolar Switch

Low-Pass

Filter

Description

The A1250 Hall-effect sensor IC is a temperature stable,

stress-resistant bipolar switch. This device is the most sensitive

Hall-effect device in the Allegro® bipolar switch family and is

intended for ring-magnet sensing. Superior high-temperature

performance is made possible through an Allegro patented

dynamic offset cancellation that utilizes chopper-stabilization.

This method reduces the offset voltage normally caused by

device overmolding, temperature dependencies, and thermal

stress.

The A1250 includes the following 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. Advanced BiCMOS

wafer fabrication processing takes advantage of low-voltage

requirements, component matching, very low input-offset

errors, and small component geometries.

The A1250 Hall-effect bipolar switch turns on in a south

polarity magnetic field of sufficient strength and switches

off in a north polarity magnetic field of sufficient strength.

Because the output state is not defined if the magnetic field

is diminished or removed, to ensure that the device switches,

Allegro recommends using magnets of both polarities and of

sufficient strength in the application.

Continued on the next page…

To All Subcircuits

Control

Current

Limit

GND

1 Ω

VOUT

A1250

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