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A1381 Datasheet(PDF) 10 Page - Allegro MicroSystems

Part No. A1381
Description  Programmable Linear Hall Effect Sensor ICs with Analog Output
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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A1381 Datasheet(HTML) 10 Page - Allegro MicroSystems

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Programmable Linear Hall Effect Sensor ICs with Analog Output
Available in a Miniature Thin Profile Surface Mount Package
A1381, A1382,
A1383, and A1384
10
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Amp
Regulator
Clock/Logic
Hall Element
Low-Pass
Filter
Concept of Chopper Stabilization Technique
When using Hall-effect technology, a limiting factor for
switchpoint accuracy is the small signal voltage developed across
the Hall element. This voltage is disproportionally small relative
to the offset that can be produced at the output of the Hall ele-
ment. This makes it difficult to process the signal while main-
taining an accurate, reliable output over the specified operating
temperature and voltage ranges. Chopper stabilization is a unique
approach used to minimize Hall offset on the chip. The patented
Allegro technique, namely Dynamic Quadrature Offset Cancella-
tion, removes key sources of the output drift induced by thermal
and mechanical stresses. This offset reduction technique is based
on a signal modulation-demodulation process. The undesired
offset signal is separated from the magnetic field-induced signal
in the frequency domain, through modulation. The subsequent
demodulation acts as a modulation process for the offset, causing
the magnetic field-induced signal to recover its original spectrum
at base band, while the DC offset becomes a high-frequency
signal. The magnetic-sourced signal then can pass through a
low-pass filter, while the modulated DC offset is suppressed. The
chopper stabilization technique uses a 170 kHz high frequency
clock. For the demodulation process, a sample and hold technique
is used, where the sampling is performed at twice the chop-
per frequency (340 kHz). This high-frequency operation allows
a greater sampling rate, which results in higher accuracy and
faster signal-processing capability. This approach desensitizes
the chip to the effects of thermal and mechanical stresses, and
produces devices that have extremely stable quiescent Hall output
voltages and Precise recoverability after temperature cycling.
This technique is made possible through the use of a BiCMOS
process, which allows the use of low-offset, low-noise amplifiers
in combination with high-density logic integration and sample-
and-hold circuits.
Chopper Stabilization Technique
Typical Application Drawing
V+
VCC
VOUT
GND
C
BYPASS
L
C


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