Datasheet > 传感器/换能器 > 磁场传感器> A3290KLHLT-T

A3290KLHLT-T

更新时间： 2024-01-16 11:56:06

品牌	Logo	应用领域
急速微 - ALLEGRO		锁存器传感器换能器磁场传感器输出元件
页数	文件大小	规格书
8页	245K
描述
Chopper Stabilized, Precision Hall Effect Latches for Consumer and Industrial Applications

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技术参数
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A3290KLHLT-T 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	SIP3,.03,50
Reach Compliance Code：	compliant	风险等级：	1.68
Is Samacsys：	N	其他特性：	OPEN COLLECTOR OUTPUT
主体宽度：	1.52 mm	主体高度：	3.02 mm
主体长度或直径：	4.09 mm	滞后：	100 mT
JESD-609代码：	e3	最大磁场范围：	5 mT
最小磁场范围：	-5 mT	安装特点：	THROUGH HOLE MOUNT
端子数量：	3	最大工作电流：	8 mA
最高工作温度：	125 °C	最低工作温度：	-40 °C
输出电路类型：	SINGLE-ENDED	最大输出电流：	25 mA
输出范围：	500mV	输出类型：	DIGITAL VOLTAGE
封装主体材料：	PLASTIC/EPOXY	封装等效代码：	SIP3,.03,50
封装形状/形式：	RECTANGULAR	电源：	4.2/24 V
传感器/换能器类型：	MAGNETIC FIELD SENSOR,HALL EFFECT	子类别：	Other Sensors/Transducers
最大供电电压：	24 V	最小供电电压：	4.2 V
表面贴装：	NO	端子面层：	Matte Tin (Sn)
端接类型：	SOLDER	Base Number Matches：	1

A3290KLHLT-T 数据手册

A3290 and

A3291

Chopper Stabilized, Precision Hall Effect Latches

for Consumer and Industrial Applications

Functional Description

technique cancels the mismatching of the resistor circuit by

Chopper-Stabilized Technique

changing the direction of the current flowing through the Hall

element. To do so, CMOS switches and Hall voltage measure-

ment taps are used, while maintaining V_HALLsignal that is

induced by the external magnetic flux.

The Hall element can be considered as a resistor array similar

to a Wheatstone bridge. A basic circuit is shown in figure 1,

demonstrating the effect of the magnetic field flux density, B,

impinging on the Hall element. When using Hall effect tech-

nology, a limiting factor for switchpoint accuracy is the small

signal voltage, V_HALL, 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, caused by device

overmolding, temperature dependencies, and thermal stress.

The signal is then captured by a sample-and-hold circuit and fur-

ther processed using low-offset bipolar circuitry. This technique

produces devices that have an extremely stable quiescent Hall

output voltage, are immune to thermal stress, and have precise

recoverability after temperature cycling. This technique will also

slightly degrade the device output repeatability. A relatively high

sampling frequency is used in order to process faster signals.

A large portion of the offset is a result of the mismatching of

these resistors. The A3290 and A3291 use a proprietary dynamic

offset cancellation technique, with an internal high-frequency

clock, to reduce the ressidual offset. The chopper-stabilizing

More detailed descriptions of the circuit operation can be found

on the Allegro Web site, including: Technical Paper STP 97-10,

Monolithic Magnetic Hall Sensor Using Dynamic Quadrature

Offset Cancellation, and Technical Paper STP 99-1, Chopper-

Stabilized Amplifiers with a Track-and-Hold Signal Demodula-

tor.

HALL

Operation

The outputs of the A3290 and A3291 switch low (turn on) when

a magnetic field perpendicular to the Hall sensor transitions

through and exceeds the Operate Point threshold, B_OP. This is

illustrated in figure 3. After turn-on, the output is capable of

–V

HALL

sinking 25 mA, and the output voltage reaches V_OUT(SAT)

Figure 1. Hall element, basic circuit operation

Hysteresis of ΔV_OUT

Switching Due to ΔB

Regulator

V+

V_OUT(off)

Low-

Pass

Filter

Amp

V_OUT(on)(sat)

B+

B_HYS

Figure 2. Chopper stabilization circuit (dynamic quadrature offset

cancellation)

Figure 3. Output voltage responds to sensed magnetic flux density.

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

1 2 3 456 7 8

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与A3290KLHLT-T相关器件

型号	品牌	描述	获取价格	数据表
A3290KLHLX-T	ALLEGRO	Chopper-Stabilized, Precision Hall-Effect Latches for Consumer and Industrial Applications	获取价格
A3290KUA-T	ALLEGRO	Chopper Stabilized, Precision Hall Effect Latches for Consumer and Industrial Applications	获取价格
A3291	ALLEGRO	Chopper Stabilized, Precision Hall Effect Latches for Consumer and Industrial Applications	获取价格
A3291KLHLT-T	ALLEGRO	Chopper Stabilized, Precision Hall Effect Latches for Consumer and Industrial Applications	获取价格
A3291KUA-T	ALLEGRO	Chopper Stabilized, Precision Hall Effect Latches for Consumer and Industrial Applications	获取价格
A3295	ALLEGRO	Chopper Stabilized, Precision Hall Effect Switch	获取价格

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