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參數(shù)資料
| 型號(hào)： | A1181 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Two-Wire, Programmable, Chopper-Stabilized, Unipolar Hall-Effect Switch |
| 中文描述： | 兩線，可編程，斬波穩(wěn)定，單極霍爾效應(yīng)開關(guān) |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 356K |
| 代理商： | A1181 |
9
A1180-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
A1180/81/82/83
Figure 2. Chopper stabilization circuit (dynamic quadrature offset cancellation)
Amp
Regulator
Clock/Logic
Hall Element
Sa
mp
le
an
d
Ho
ld
Low-Pass
Filter
Chopper Stabilization Technique
A limiting factor for switchpoint accuracy when using Hall
effect technology is the small signal voltage developed across
the Hall element. This voltage is proportionally small relative to
the offset that can be produced at the output of the Hall sensor
device. This makes it difcult to process the signal and maintain
an accurate, reliable output over the specied temperature and
voltage range.
Chopper stabilization is a unique approach used to minimize
Hall offset on the chip. The Allegro patented technique, dynamic
quadrature offset cancellation, removes key sources of the output
drift induced by temperature and package stress. This offset
reduction technique is based on a signal modulation-demodula-
tion process. The undesired offset signal is separated from the
magnetically induced signal in the frequency domain through
modulation. The subsequent demodulation acts as a modulation
process for the offset causing the magnetically induced signal
to recover its original spectrum at base band while the dc offset
becomes a high frequency signal. Then, using a low-pass lter,
the signal passes while the modulated dc offset is suppressed.
The chopper stabilization technique uses a 200 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 (400KHz). The sampling demodulation
process produces higher accuracy and faster signal processing
capability. Using this chopper stabilization approach, the chip is
desensitized to the effects of temperature and stress. This tech-
nique produces devices that have an extremely stable quiescent
Hall output voltage, is immune to thermal stress, and has precise
recoverability after temperature cycling. This technique is made
possible through the use of a BiCMOS process which allows the
use of low-offset and low-noise ampliers in combination with
high-density logic integration and sample-and-hold circuits.
The repeatability of switching with a magnetic eld is slightly
affected using a chopper technique. The Allegro high frequency
chopping approach minimizes the affect of jitter and makes it
imperceptible in most applications. Applications that may notice
the degradation are those that require the precise sensing of alter-
nating magnetic elds such as ring magnet speed sensing. For
those applications, Allegro recommends the “l(fā)ow jitter” family
of digital sensors.
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