A1381EUA-T Allegro Microsystems Inc, A1381EUA-T Datasheet - Page 10

• Manufacturer Part Number: A1381EUA-T
• Description: IC SENSOR HALL EFFECT PREC 3-SIP
• Manufacturer: Allegro Microsystems Inc
• Type: Linear - Programmabler

Specifications of A1381EUA-T

• Sensing Range: 6mV/G ~ 9mV/G
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 8mA
• Current - Output (max): 10mA
• Output Type: Analog, Ratiometric
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 3-SIP
• Peak Reflow Compatible (260 C): Yes
• Accuracy %: 1.5%
• Supply Voltage: 5V
• Output Current: 2mA
• Termination Type: SIP
• Bandwidth: 12kHz
• Supply Voltage Max: 5.5V
• Sensitivity: 6 To 9 MV/G
• Leaded Process Compatible: Yes
• No. Of Pins: 3
• Hall Effect Type: Linear
• Supply Voltage Min: 4.5V
• Operating Temperature Max: 85°C
• Rohs Compliant: Yes
• Filter Terminals: SIP
• Operating Temperature Min: -40°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

A1381, A1382,
A1383, and A1384
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
Programmable Linear Hall Effect Sensor ICs with Analog Output
Hall Element
Concept of Chopper Stabilization Technique
Available in a Miniature Thin Profile Surface Mount Package
C
Chopper Stabilization Technique
BYPASS
Typical Application Drawing
V+
Regulator
VCC
GND
VOUT
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.
Clock/Logic
Amp
C
L
Low-Pass
Filter
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
10