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A1192LUBTN-T Datasheet(PDF) 11 Page - Allegro MicroSystems |
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A1192LUBTN-T Datasheet(HTML) 11 Page - Allegro MicroSystems |
11 / 22 page Programmable, Chopper-Stabilized, Two-Wire Hall-Effect Switches A119x and A119x-F 11 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 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 patentedAllegrotechnique,namelyDynamicQuadratureOffset 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 itsoriginalspectrumatbaseband,whiletheDCoffsetbecomes a high-frequency signal. The magnetic-sourced signal then can passthroughalow-passfilter,whilethemodulatedDCoffsetis 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. |
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