Datasheet > A1242ELHLT-I2-T

A1242ELHLT-I2-T

更新时间： 2024-01-24 08:10:57

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
11页	364K
描述
Two-Wire Chopper-Stabilized Hall Effect Latch

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A1242ELHLT-I2-T 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	TO-236	Reach Compliance Code：	unknown
风险等级：	5.83	其他特性：	REVERSE BATTERY PROTECTION
主体宽度：	1.91 mm	主体高度：	1 mm
主体长度或直径：	2.98 mm	滞后：	6.4 mT
输入模式：	UNIPOLAR	JESD-609代码：	e3
最大磁场范围：	8 mT	最小磁场范围：	-8 mT
安装特点：	SURFACE MOUNT	端子数量：	3
最大工作电流：	17 mA	最高工作温度：	85 °C
最低工作温度：	-40 °C	输出接口类型：	2-WIRE INTERFACE
输出类型：	ANALOG CURRENT	封装主体材料：	PLASTIC/EPOXY
封装等效代码：	TO-236	封装形状/形式：	RECTANGULAR
电源：	3.5/24 V	传感器/换能器类型：	MAGNETIC FIELD SENSOR,HALL EFFECT
子类别：	Other Sensors	最大供电电压：	24 V
最小供电电压：	3.5 V	表面贴装：	YES
技术：	BICMOS	端子面层：	Matte Tin (Sn)
端接类型：	SOLDER	Base Number Matches：	1

A1242ELHLT-I2-T 数据手册

A1242

Two-Wire Chopper-Stabilized Hall Effect Latch

Chopper Stabilization Technique

When using Hall-effect technology, a limiting factor 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 sensor. This makes it difficult to process the signal while

maintaining an accurate, reliable output over the specified oper-

ating temperature and voltage ranges.

technique is used, where the sampling is performed at twice the

chopper frequency (400 kHz). This high-frequency operation

allows a greater sampling rate, which results in higher accuracy

and faster signal-processing capability. This approach desensi-

tizes the chip to the effects of thermal and mechanical stresses,

and produces devices that have extremely stable quiescent Hall

output voltages and precise recoverability after temperature

cycling. This technique is made possible through the use of a

BiCMOS process, which allows the use of low-offset, low-noise

amplifiers in combination with high-density logic integration

and sample-and-hold circuits.

Chopper stabilization is a unique approach used to minimize

Hall offset on the chip. The patented Allegro technique, namely

Dynamic Quadrature Offset Cancellation, removes key sources

of the output drift induced by thermal and mechanical stresses.

This offset reduction technique is based on a signal modulation-

demodulation process. The undesired offset signal is separated

from the magnetic field-induced signal in the frequency domain,

through modulation. The subsequent demodulation acts as a

modulation process for the offset, causing the magnetic field

induced signal to recover its original spectrum at baseband,

while the dc offset becomes a high-frequency signal. The

magnetic sourced signal then can pass through a low-pass filter,

while the modulated dc offset is suppressed. This configuration

is illustrated in Figure 3.

The repeatability of magnetic field-induced switching is affected

slightly by a chopper technique. However, the Allegro high

frequency chopping approach minimizes the affect of jitter and

makes it imperceptible in most applications. Applications that

are more likely to be sensitive to such degradation are those

requiring precise sensing of alternating magnetic fields; for

example, speed sensing of ring-magnet targets. For such applica-

tions,

Allegro recommends its digital sensor families with lower sen-

sitivity to jitter. For more information on those devices, contact

your Allegro sales representative.

The chopper stabilization technique uses a 200 kHz high

frequency clock. For demodulation process, a sample and hold

Regulator

Clock/Logic

Low-Pass

Filter

Hall Element

Amp

Figure 3. Chopper stabilization circuit (dynamic quadrature offset cancellation)

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

A1242-DS

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

www.allegromicro.com

1...5 6 789 10 11

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与A1242ELHLT-I2-T相关器件

型号	品牌	描述	获取价格	数据表
A1242EUA-I1-T	ALLEGRO	Two-Wire Chopper-Stabilized Hall Effect Latch	获取价格
A1242EUA-I2-T	ALLEGRO	Two-Wire Chopper-Stabilized Hall Effect Latch	获取价格
A1242LLHLT-I1-T	ALLEGRO	Two-Wire Chopper-Stabilized Hall Effect Latch	获取价格
A1242LLHLT-I2-T	ALLEGRO	Two-Wire Chopper-Stabilized Hall Effect Latch	获取价格
A1242LUA-I1-T	ALLEGRO	Two-Wire Chopper-Stabilized Hall Effect Latch	获取价格
A1242LUA-I2-T	ALLEGRO	Two-Wire Chopper-Stabilized Hall Effect Latch	获取价格
A1244	ALLEGRO	Chopper-Stabilized, Two Wire Hall-Effect Latch	获取价格
A12442MNCB	ITT	Rotary Switch, 4 Positions, SP4T, Latched, 0.02A, 20VDC, Solder Terminal, High-metric Actu	获取价格
A12442MNCBE	ITT	Rotary Switch, 4 Positions, SP4T, Latched, 0.02A, 20VDC, Solder Terminal, High-metric Actu	获取价格
A12442MNCBF	ITT	Rotary Switch, 4 Positions, SP4T, Latched, 0.02A, 20VDC, Solder Terminal, High-metric Actu	获取价格

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