Figure 2. Typical application circuits
GND
A119x
VCC
V+
0.01 糉
A
GND
ECU
Package UA Only
A
R
SENSE
C
BYP
GND
A119x
VCC
V+
0.01 糉
A
GND
R
SENSE
C
BYP
(A) Low side sensing
(B) High side sensing
Figure 3. Chopper stabilization circuit (Dynamic Quadrature Offset Cancellation)
Amp
Regulator
Clock/Logic
Hall Element
Low-Pass
Filter
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 IC. This makes it difficult to process the signal while
maintaining an accurate, reliable output over the specified oper-
ating temperature and voltage ranges. 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 base band, 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. The chopper stabilization technique uses a 350 kHz
high frequency clock. For demodulation process, a sample and
hold technique is used, where the sampling is performed at twice
the chopper frequency. This high-frequency operation allows
a greater sampling rate, which results in higher accuracy and
faster signal-processing capability. This approach desensitizes
the chip to the effects of thermal and mechanical stresses, and
produces devices that have extremely stable quiescent Hall out-
put 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.
Programmable, Chopper-Stabilized,
Two Wire Hall-Effect Switches
A1190, A1192,
and A1193
8
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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相关PDF资料
A1203LUA-T
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相关代理商/技术参数
A1193LUBTN-F-T
功能描述:2-WIRE FIELD PROGRAMMABLE SWITCH 制造商:allegro microsystems, llc 系列:- 包装:* 零件状态:新产品 功能:单极开关 技术:霍尔效应 极化:南极 感应范围:1mT Trip, -1mT Release 测试条件:25°C 电压 - 电源:3 V ~ 24 V 电流 - 电源（最大值）:5mA 电流 - 输出（最大值）:17mA 输出类型:开路漏极 特性:可编程跳变点 工作温度:-40°C ~ 150°C（TA） 封装/外壳:2-SIP 供应商器件封装:* 标准包装:1
A1193LUBTN-T
功能描述:2-WIRE FIELD PROGRAMMABLE SWITCH 制造商:allegro microsystems, llc 系列:- 包装:* 零件状态:新产品 功能:单极开关 技术:霍尔效应 极化:南极 感应范围:1mT Trip, -1mT Release 测试条件:25°C 电压 - 电源:3 V ~ 24 V 电流 - 电源（最大值）:5mA 电流 - 输出（最大值）:17mA 输出类型:开路漏极 特性:可编程跳变点 工作温度:-40°C ~ 150°C（TA） 封装/外壳:2-SIP 供应商器件封装:* 标准包装:1
A1194LLHLT-T
功能描述:IC HALL EFFECT SWITCH SOT-23-3 RoHS:是 类别:传感器，转换器 >> 磁性 - 霍尔效应，数字式开关，线性，罗盘 (IC) 系列:- 标准包装:1 系列:- 传感范围:20mT ~ 80mT 类型:旋转 电源电压:4.5 V ~ 5.5 V 电流 - 电源:15mA 电流 - 输出（最大）:- 输出类型:数字式，PWM，8.5 位串行 特点:可编程 工作温度:-40°C ~ 150°C 封装/外壳:20-SSOP（0.209"，5.30mm 宽） 供应商设备封装:20-SSOP 包装:Digi-Reel® 其它名称:AS5132-HSST-500DKR
A1194LLHLX-T
功能描述:IC HALL EFFECT SWITCH SOT-23-3 RoHS:是 类别:传感器，转换器 >> 磁性 - 霍尔效应，数字式开关，线性，罗盘 (IC) 系列:- 标准包装:1 系列:- 传感范围:20mT ~ 80mT 类型:旋转 电源电压:4.5 V ~ 5.5 V 电流 - 电源:15mA 电流 - 输出（最大）:- 输出类型:数字式，PWM，8.5 位串行 特点:可编程 工作温度:-40°C ~ 150°C 封装/外壳:20-SSOP（0.209"，5.30mm 宽） 供应商设备封装:20-SSOP 包装:Digi-Reel® 其它名称:AS5132-HSST-500DKR
A1198
制造商:SONY 制造商全称:Sony Corporation 功能描述:STEREO CASSETTE DECK RECORDING EQUALIZER
A1199H1698
制造商:MERITR 功能描述:
A119ANS-17152Z
功能描述:INDUCTOR 10.7UH 2.52MHZ TYPE 7PH RoHS:否 类别:电感器，线圈，扼流圈 >> 可调型 系列:7PH 标准包装:100 系列:7KMM 电感:560nH 容差:±6% Q因子@频率:50 @ 50MHz 安装类型:通孔 尺寸/尺寸:0.307" L x 0.307" W（7.80mm x 7.80mm） 高度:0.512"（13.00mm） 包装:散装 其它名称:TK3120
A119ANS-17153Y
功能描述:INDUCTOR 10.7UH 2.52MHZ TYPE 7PH RoHS:否 类别:电感器，线圈，扼流圈 >> 可调型 系列:7PH 标准包装:100 系列:7KMM 电感:560nH 容差:±6% Q因子@频率:50 @ 50MHz 安装类型:通孔 尺寸/尺寸:0.307" L x 0.307" W（7.80mm x 7.80mm） 高度:0.512"（13.00mm） 包装:散装 其它名称:TK3120