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| 型號(hào)： | A1171EEWLT-P |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Micropower Ultrasensitive Hall Effect Switch |
| 中文描述： | 微超靈敏霍爾效應(yīng)開(kāi)關(guān) |
| 文件頁(yè)數(shù)： | 8/9頁(yè) |
| 文件大小： | 588K |
| 代理商： | A1171EEWLT-P |
Micropower Ultrasensitive Hall Effect Switch
A1171
8
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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.
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 mag-
netic sourced signal then can pass through a low-pass filter,
while the modulated dc offset is suppressed. This configuration
is illustrated in figure 4.
The chopper stabilization technique uses a 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 output voltages and precise
recoverability after temperature cycling.
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
sensitivity to jitter. For more information on those devices,
contact your Allegro sales representative.
Amp
Regulator
Clock/Logic
Hall Element
S
H
L
F
Figure 4. Chopper Stabilization Circuit (Dynamic Quadrature Offset Cancellation)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A1172 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Micropower Ultra-Sensitive Hall-Ef fect Switch |
| A-1172 | 功能描述:通用繼電器 DC SOLENOID RoHS:否 制造商:Omron Electronics 觸點(diǎn)形式:1 Form A (SPST-NO) 觸點(diǎn)電流額定值:150 A 線圈電壓:24 VDC 線圈電阻:144 Ohms 線圈電流:167 mA 切換電壓:400 V 安裝風(fēng)格:Chassis 觸點(diǎn)材料: |
| A1172_13 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Micropower Ultra-Sensitive Hall-Ef fect Switch |
| A11720-000 | 制造商:TE Connectivity 功能描述:VARISTOR 200VDC 20MM 10% LEADED 制造商:TE Connectivity 功能描述:VARISTOR 200V 12.5KA DISC 20MM |
| A1172ECGLT | 功能描述:IC HALL EFFECT SW 1.65V 4-WLCSP RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開(kāi)關(guān)，線性，羅盤 (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型:旋轉(zhuǎn) 電源電壓:4.5 V ~ 5.5 V 電流 - 電源:15mA 電流 - 輸出（最大）:- 輸出類型:數(shù)字式，PWM，8.5 位串行 特點(diǎn):可編程 工作溫度:-40°C ~ 150°C 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:20-SSOP 包裝:Digi-Reel® 其它名稱:AS5132-HSST-500DKR |
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