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A1422

Allegro MicroSystems
Part Number A1422
Manufacturer Allegro MicroSystems
Description High Precision Hall Effect AC-Coupled Differential Sensor
Published Sep 26, 2005
Detailed Description A1421, A1422, and A1423 High Precision Hall Effect AC-Coupled Differential Sensor IC with Integrated Filter Capacitor F...
Datasheet PDF File A1422 PDF File

A1422
A1422

Overview
A1421, A1422, and A1423 High Precision Hall Effect AC-Coupled Differential Sensor IC with Integrated Filter Capacitor Features and Benefits • Integrated tracking capacitor • Used for sensing motion of ring magnet or ferrous targets • Wide operating temperature range • Operation with magnetic input signal frequency from 20 Hz to 30 kHz • EMI/ESD-resistant • Large effective air gaps • 4.
0 to 26.
5 V supply operating range • Output compatible with CMOS logic families • Reverse battery protection • Resistant to mechanical and thermal stress • Accurate true zero crossing switchpoint (A1421 only) • High vibration immunity, in running mode (A1423 only) Package: 4 pin SIP (suffix K) Description The A1421, A1422, and A1423 are AC-coupled Hall-effect sensor ICs which include monolithic integrated circuits that switch in response to changing differential magnetic fields created by rotating ring magnets or, when coupled with a magnet, by ferrous targets.
This family of devices also includes an integrated capacitor that provides the high accuracy of analog sensing without an external filter capacitor.
This reduces cost and components, while improving the reliability of the final sensor solution.
Magnetic field changes affect the two integrated Hall transducers and then are differentially amplified on the chip.
Differential design provides immunity to radial vibration, within the device operating air gap range, by rejection of this common-mode signal change.
Steady-state system offsets are eliminated using an on-chip differential bandpass filter with integrated capacitor.
This filter also provides relative immunity to interference from electromagnetic sources.
The device utilizes advanced temperature compensation for the high-pass filter, sensitivity, and Schmitt trigger switchpoints to guarantee optimal operation to low frequencies over a wide range of air gaps and temperatures.
Not to scale Continued on the next page… VS+ VCC (Pin 1) Functional Block Diagram Dual Hall Tra...


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