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A1423LK-T, A1423ND, A1425

Table of contents:
Info of A1423LK-T
Info of A1423ND
Info of A1425

A1423LK-T, A1423ND, A1425 Selling Leads, Datasheet

MFG:allegro Package Cooled:N/A D/C:09+

A1423LK-T, A1423ND, A1425 Datasheet download

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Part Number: A1423LK-T

MFG: allegro

Package Cooled: N/A

D/C: 09+

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A1425 General Description

The A1425 ac-coupled Hall-effect sensor is a monolithic integrated circuit that switches in response to changing differential magnetic ﬁ elds created by rotating ring magnets or, 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 ﬁ eld strength between the two Hall elements is zero. A unique dual- comparator scheme provides for accurate switching during zero-crossing, both when the sensed ﬁ eld is increasing in strength and when it is decreasing, while utilizing hysteresis to prevent false switching. The zero-crossing nature of this device provides excellent repeatability for crankshaft applications.

Changes in ﬁ eld strength at the device face caused by a moving target are sensed by the two integrated Hall transducers, generating signals that are differen- tially ampliﬁ ed by on-chip electronics. This differential sensing 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 ﬁ lter. This ﬁ lter also provides relative immunity to interference from electromagnetic sources.

A1425 Maximum Ratings

Supply Voltage, VCC ....................................... ..28 V
Reverse-Supply Voltage, VRCC .......................18 V
Output Current, IOUT.................................... .25 mA
Reverse-Output Current, IROUT...................50 mA
Reverse-Output Voltage, VROUT .................50 mA
Operating Temperature
Ambient, TA....................................40ºC to 150ºC
Maximum Junction, TJ(max).............................165ºC
Storage Temperature, TS ...............65ºC to 170ºC

A1425 Features

• Senses motion of ring magnet targets
• Integrated ﬁ lter capacitor
• Wide operating temperature range
• Operation with frequency of sensed transitions from 20 Hz to 30 kHz
• EMI-resistant
• Large working air gaps
• 4.0 to 26.5 V operating range
• Output compatible with both TTL and CMOS logic families
• Reverse battery protection

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