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A3425

Ultra-Sensitive Dual-Channel Quadrature

Hall-Effect Bipolar Switch

Features and Benefits

Two matched Hall effect switches on a single substrate

Sensor Hall element spacing approximately 1 mm

Superior temperature stability

3.3 to 18 V operation

Integrated ESD diode from OUTPUT and VCC pins

to GND

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High-sensitivity switchpoints

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Robust structure for EMC protection

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Solid-state reliability

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Description

The A3425 is a dual鈥搊utput-channel, bipolar switch with

each channel comprising a separate complete Hall-effect

sensor circuit with dedicated Hall element and separate digital

output for speed and direction signal processing capability. The

independent Hall elements (E1 integrated with

OUTPUTA

, and

E2 integrated with

OUTPUTB

) are photolithographically aligned

to better than 1

渭m.

Maintaining this accurate mechanical

location between the two active Hall elements eliminates the

major manufacturing hurdle encountered in fine-pitch detection

applications. The A3425 is a highly sensitive, temperature-stable

magnetic sensing device, which is ideal for use in ring magnet-

based speed and direction systems used in harsh automotive

and industrial environments.

The A3425 contains two independent Hall effect switches, and

has a monolithic IC that accurately locates the two Hall elements,

E1 and E2, approximately 1 mm apart. The digital outputs are

90潞 out of phase so that the outputs are in quadrature, with the

proper ring magnet design. This allows for easy processing of

speed and direction signals. Extremely low-drift amplifiers

guarantee symmetry between the switches to maintain signal

Package: 8 pin SOIC (suffix L), and 4 pin

SIP (suffix K)

Continued on the next page鈥?/div>

Not to scale

Typical Application

V

OUTPUTB

V

OUTPUTA

2

OUTPUTA

V

Supply

100

惟

1

A3425

VCC

OUTPUTB

3

GND

4

0.1 uF

Using unregulated supply

A3425DS-Rev. 6

型號(hào)

版本

描述

廠商

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A3425_06 Datasheet

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