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A1230 Datasheet(PDF) 11 Page - Allegro MicroSystems |
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A1230 Datasheet(HTML) 11 Page - Allegro MicroSystems |
11 / 17 page Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch A1230 11 Allegro MicroSystems, LLC 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com FUNCTIONAL DESCRIPTION A limiting factor for switchpoint accuracy when using Hall effect technology is the small signal voltage developed across the Hall plate. This voltage is proportionally small relative to the offset that can be produced at the output of the Hall IC. This makes it difficult to process the signal and maintain an accurate, reliable output over the specified 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 baseband while the DC offset becomes a high frequency signal. Then, using a low-pass filter the signal passes while the modulated DC offset is suppressed. Allegro’s new innovative chopper-stabilization technique uses a high frequency clock. This chopper-stabilization approach de- sensitizes the IC to temperature and stress. The high-frequency operation also allows a greater sampling rate that produces higher accuracy and faster signal processing capability. Additionally, filtering is more effective and results in a lower noise analog signal at the input to the Schmitt trigger. Therefore, this high- frequency chopping technique reduces jitter, also known as 360° repeatability, can be induced on the output signal. The sample- and-hold process, used by the demodulator to store and recover the signal, can slightly degrade the signal to noise ratio. This is because the process generates replicas of the noise spectrum at the baseband, causing a decrease in jitter performance. However, the improvement in switchpoint performance, resulting from the reduc- tion of the effects of thermal and mechanical stress, outweighs the degradation in the signal to noise ratio. This technique produces devices that have an extremely stable quiescent Hall output voltage, are immune to thermal stress, and have 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 amplifiers in combination with high-density logic integration and sample and hold circuits. Figure 1: Chopper Stabilization Circuit (Dynamic Quadrature Offset Cancellation) Amp Regulator Low- Pass Filter Chopper-Stabilized Technique |
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