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| 型号： | A3250JUATL |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PSSO3 |
| 封装： | ULTRA MINI, TO-92, SIP-3 |
| 文件页数： | 14/15页 |
| 文件大小： | 730K |
| 代理商： | A3250JUATL |
8
A3250-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Field-Programmable, Chopper-Stabilized, Unipolar Hall-Effect Switches
A3250 and A3251
Functional Description
Chopper-Stabilized Technique
The Hall sensor is based on a Hall element, a small sheet of
semiconductor material in which a constant bias current flows
when a constant voltage source is applied. The output takes the
form of a voltage measured across the width of the Hall element,
and has negligible value in the absence of a magnetic field.
When a magnetic field is applied with flux lines at right angles
to the current in the Hall element, a small signal voltage directly
proportional to the strength of the magnetic field occurs at the
output of the Hall element.
This small signal voltage is disproportionally small relative to
the offset produced at the input of the device. This makes it very
difficult to process the signal and maintain an accurate, reliable
output over the specified temperature and voltage range. There-
fore, it is important to reduce any distortion of the signal that
could be amplified when the signal is processed.
Chopper stabilization is a unique approach used to minimize
input offset on the Hall IC. This technique removes a key
source of output drift due to temperature and mechanical stress,
and produces a 3X reduction in offset in comparison to other,
conventional methods.
This offset reduction chopping technique is based on a sig-
nal modulation-demodulation process. The undesired offset
signal is separated from the magnetically-induced signal in the
frequency domain. The offset (and any low-frequency noise)
component of the signal can be seen as signal distortion added
after the signal modulation process has taken place. Therefore,
the dc offset is not modulated and remains a low-frequency
component. Consequently, the signal demodulation process acts
as a modulation process for the offset, causing the magnetically-
induced signal to recover its original spectrum at baseband while
the dc offset becomes a high-frequency signal. Then, the signal
passes using a low-pass filter, while the modulated dc offset is
suppressed.
The advantage of this approach is significant offset reduction,
which desensitizes the Hall IC against the effects of temperature
and mechanical stress. The disadvantage is that this technique
features a demodulator that uses a sample-and-hold block to
store and recover the signal. This sampling process can slightly
degrade the SNR (signal-to-noise ratio) by producing replicas of
the noise spectrum at the baseband. This degradation is a function
of the ratio between the white noise spectrum and the sampling
frequency. The effect of the degradation of the SNR is higher
jitter, also known as signal repeatability. However, the jitter in a
continuous-time device can be 5X that of the A3250/A3251.
Chopper stabilization circuit (dynamic quadrature offset cancellation)
Amp
Regulator
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Ho
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A3250LLT | 功能描述:IC SW HALL EFFECT UNI SOT-89 RoHS:否 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 |
| A3250LLT-T | 功能描述:IC SW HALL EFFECT UNI SOT-89 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 |
| A3250LLTTR | 功能描述:IC SW HALL EFFECT UNI SOT-89 RoHS:否 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 |
| A3250LLTTR-T | 功能描述:IC SW HALL EFFECT UNI SOT-89 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 |
| A3250LUA | 功能描述:IC SW HALL EFFECT UNI 3-SIP RoHS:否 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 |
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