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
Description
TheA132X family of linear Hall-effect sensors are optimized,
sensitive,andtemperature-stable.TheseratiometricHall-effect
▪ 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
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.
▪ Robust EMC protection
EachdevicehasaBiCMOSmonolithiccircuitwhichintegrates
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.
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
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
accuracyandfastersignalprocessingcapability.Thistechnique
producesdevicesthathaveanextremelystablequiescentoutput
voltage, are immune to mechanical stress, and have precise
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Not to scale
Functional Block Diagram
V+
VCC
VOUT
Out
Amp
Gain
Offset
0.1 μF
Trim
Control
GND
A1321-DS, Rev. 8