ACS712 Allegro MicroSystems, Inc., ACS712 Datasheet - Page 11

• Manufacturer Part Number: ACS712
• Description: Fully Integrated, Hall Effect-based Linear Current Sensor With 2.1 Kvrms Voltage Isolation And A Low-resistance Current Conductor
• Manufacturer: Allegro MicroSystems, Inc.

ACS712
Chopper Stabilization is an innovative circuit technique that is
used to minimize the offset voltage of a Hall element and an asso-
ciated on-chip amplifier. Allegro patented a Chopper Stabiliza-
tion technique that nearly eliminates Hall IC output drift induced
by temperature or package stress effects. This offset reduction
technique is based on a signal modulation-demodulation process.
Modulation is used to separate the undesired dc offset signal from
the magnetically induced signal in the frequency domain. Then,
using a low-pass filter, the modulated dc offset is suppressed
while the magnetically induced signal passes through the filter.
Hall Element
2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Chopper Stabilization Technique
Regulator
Fully Integrated, Hall Effect-Based Linear Current Sensor with
Concept of Chopper Stabilization Technique
As a result of this chopper stabilization approach, the output
voltage from the Hall IC is desensitized to the effects of tempera-
ture and mechanical stress. This technique produces devices that
have an extremely stable Electrical Offset Voltage, are immune to
thermal stress, and have precise recoverability after temperature
cycling.
This technique is made possible through the use of a BiCMOS
process that allows the use of low-offset and low-noise amplifiers
in combination with high-density logic integration and sample
and hold circuits.
Clock/Logic
Amp
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
Low-Pass
Filter
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