A3425LK-T

更新时间： 2024-01-03 23:20:32

品牌	Logo	应用领域
急速微 - ALLEGRO		模拟IC 开关信号电路信息通信管理
页数	文件大小	规格书
21页	574K
描述
Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch

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A3425LK-T 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	SOIC
包装说明：	SOIC-8	针数：	8
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.8	模拟集成电路 - 其他类型：	ANALOG CIRCUIT
JESD-30 代码：	R-PDSO-G8	JESD-609代码：	e3
长度：	4.9 mm	功能数量：	1
端子数量：	8	最高工作温度：	150 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified	座面最大高度：	1.75 mm
最大供电电压 (Vsup)：	18 V	最小供电电压 (Vsup)：	3.3 V
标称供电电压 (Vsup)：	12 V	表面贴装：	YES
技术：	BICMOS	温度等级：	AUTOMOTIVE
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	40	宽度：	3.9 mm
Base Number Matches：	1

A3425LK-T 数据手册

A3425

Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch

Functional Description

Chopper-Stabilized Technique

When using Hall effect technology, a limiting factor

chop frequency. This high-frequency operation allows

for a greater sampling rate, which produces higher

accuracy and faster signal processing capability. This

approach desensitizes the chip to the effects of ther-

mal and mechanical stress. The disadvantage to this

approach is that jitter, also known as 360° repeatability,

can be induced on the output signal. The sample-and-

hold process, used by the demodulator to store and

recover the signal, can slightly degrade the signal-to-

noise ratio. This is because the process generates rep-

licas of the noise spectrum at the baseband, causing a

decrease in jitter performance. However, the improve-

ment in switchpoint performance, resulting from the

reduction of the effects of thermal and mechanical

stress, outweighs the degradation in the signal-to-noise

ratio.

for switchpoint accuracy is the small signal voltage

developed across the Hall element. This voltage is

disproportionally small relative to the offset that can

be produced at the output of the Hall device. This

makes it difﬁcult to process the signal and maintain

an accurate, reliable output over the speciﬁed tem-

perature and voltage range.

Chopper stabilization is a unique approach used

to minimize Hall offset on the chip. The patented

Allegro technique, dynamic quadrature offset can-

cellation, removes key sources of the output drift

induced by thermal and mechanical stress. This offset

reduction technique is based on a signal modulation-

demodulation process. The undesired offset signal is

separated from the magnetically induced signal in the

frequency domain through modulation. The subse-

quent demodulation acts as a modulation process for

the offset, causing the magnetically-induced signal to

recover its original spectrum at the baseband level,

while the dc offset becomes a high-frequency signal.

Then, using a low-pass ﬁlter, the signal passes while

the modulated dc offset is suppressed.

This technique produces devices that have an

extremely stable quiescent Hall element output volt-

age, are immune to thermal stress, and have precise

recoverability after temperature cycling. This tech-

nique is made possible through the use of a BiCMOS

process, which allows the use of low-offset and

low-noise ampliﬁers in combination with high-density

logic integration and sample-and-hold circuits. This

process is illustrated in the following diagram.

The chopper stabilization technique uses a 170 kHz

high-frequency clock. The Hall element chopping

occurs on each clock edge, resulting in a 340 kHz

Regulator

Low-

Pass

Filter

Amp

Chopper stabilization circuit (dynamic quadrature offset cancellation)

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

A3425DS-Rev. !

1...4 5 678 9 10...21

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与A3425LK-T相关器件

型号	品牌	描述	获取价格	数据表
A3425LK-TL	ALLEGRO	暂无描述	获取价格
A3425LKTN	ALLEGRO	Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch	获取价格
A3425LKTN-T	ALLEGRO	Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch	获取价格
A3425LK-TS	ALLEGRO	Analog Circuit, 2 Func, BIPolar, PSSO4, SMT-4	获取价格
A3425LL	ALLEGRO	Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch	获取价格
A3425LL-T	ALLEGRO	Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch	获取价格

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