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A1425 Datasheet High Accuracy Analog Speed Sensor

Manufacturer: Allegro MicroSystems

Overview: A1425 High Accuracy Analog Speed Sensor IC with Integrated Filter Capacitor and Dual Zero-Crossing Output.

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General Description

The A1425 AC-coupled Hall-effect sensor IC is a monolithic integrated circuit that switches in response to changing differential magnetic fields created by rotating ring magnets and, when coupled with a magnet, by ferrous targets.

The device is a true zero-crossing detector: the output switches precisely when the difference in magnetic field strength between the two Hall elements is zero.

A unique dual-comparator scheme provides for accurate switching at the zero crossing on both the positive and negative-going regions of the differential signal, while utilizing hysteresis to prevent false switching.

Key Features

  • Used in sensing motion of ring magnet or ferrous targets.
  • Integrated filter capacitor.
  • Wide operating temperature range.
  • Operation with magnetic input signal frequency from 20 Hz to 20 kHz.
  • Resistant to EMI.
  • Large effective air gaps.
  • 4.0 to 26.5 V supply operating range.
  • Output compatible with both TTL and CMOS logic families.
  • Reverse battery protection.
  • Resistant to mechanical and thermal stress.
  • Accurate true zero-crossing switch point PA.

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