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A1425 Dataheets PDF



Part Number A1425
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description High Accuracy Analog Speed Sensor
Datasheet A1425 DatasheetA1425 Datasheet (PDF)

A1425 High Accuracy Analog Speed Sensor IC with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal FEATURES AND BENEFITS ▪ 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 protectio.

  A1425   A1425



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A1425 High Accuracy Analog Speed Sensor IC with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal FEATURES AND BENEFITS ▪ 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 PACKAGE: 4 pin SIP (suffix K) 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. The zerocrossing nature of this device provides excellent repeatability and accuracy for crankshaft applications. Changes in field strength at the device face, which are induced by a moving target, are sensed by the two integrated Hall transducers. The transducers generate signals that are differentially amplified by on-chip electronics. This differential design provides immunity to radial vibration within the operating air gap range of the A1425, by rejection of the common mode signal. Steady-state magnet and system offsets are eliminated using an on-chip differential band-pass filter. This filter also provides relative immunity to interference from electromagnetic sources. Continued on the next page… VS+ VCC (Pin 1) Functional Block Diagram Dual Hall Transducers Regulator 0.1 uF Hall Amp Gain Stage Bandpass Filter Integrated Tracking Capacitor VREF Diagnostic Circuitry Comparator TEST (Pin 3) VOUT (Pin 2) 1425-DSa, Rev.5 MCO-0000608 GND (Pin 4) (Required) February 27, 2020 A1425 High Accuracy Analog Speed Sensor IC with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal Description (continued) The device utilizes advanced temperature compensation for the high-pass filter, sensitivity, and Schmitt trigger switch points, to guarantee optimal operation to low frequencies over a wide range of air gaps and temperatures. Each Hall effect digital integrated circuit includes a voltage regulator, two Hall effect elements, temperature compensating circuitry, a low-level amplifier, band-pass filter, Schmitt trigger, and an output driver, which requires a pull-up resistor. The onboard regulator permits operation with supply voltages from 4.0 to 26.5 V. The output stage can easily switch 20 mA over the full fr.


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