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參數資料
| 型號： | A1120LUA-T |
| 廠商： | Allegro Microsystems Inc |
| 文件頁數： | 13/18頁 |
| 文件大?。?/td> | 407K |
| 描述： | IC SW HALL EFFECT CHOPPER 3-SIP |
| 產品培訓模塊： | Current Sensor |
| 標準包裝： | 4,000 |
| 傳感范圍： | 50G 跳閘，5G 釋放 |
| 類型： | 單極開關 |
| 電源電壓： | 3 V ~ 24 V |
| 電流 - 電源： | 4mA |
| 電流 - 輸出（最大）： | 25mA |
| 輸出類型： | 數字式，開漏極 |
| 特點： | 高溫 |
| 工作溫度： | -40°C ~ 150°C |
| 封裝/外殼： | 3-SIP |
| 供應商設備封裝： | 3-SIP |
| 包裝： | 散裝 |
| 產品目錄頁面： | 1139 (CN2011-ZH PDF) |
| 其它名稱： | 620-1330 |
Chopper Stabilized Precision Hall Effect Switches
A1120, A1121, A1122,
A1123, and A1125
13
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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 ele-
ment. This makes it difficult to process the signal while main-
taining an accurate, reliable output over the specified operating
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 magnetic
sourced signal then can pass through a low-pass filter, while the
modulated DC offset is suppressed. This configuration is illus-
trated in figure 2.
The chopper stabilization technique uses a 400 kHz high fre-
quency clock. For demodulation process, a sample and hold
technique is used, where the sampling is performed at twice the
chopper frequency (800 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.
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 applications, Allegro
recommends its digital device families with lower sensitivity
to jitter. For more information on those devices, contact your
Allegro sales representative.
Figure 2. Model of chopper stabilization technique
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相關代理商/技術參數 |
參數描述 |
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| A1120LUA-T | 制造商:Allegro MicroSystems 功能描述:Hall Effect Switch IC |
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