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A3425 Datasheet(PDF) 7 Page - Allegro MicroSystems |
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A3425 Datasheet(HTML) 7 Page - Allegro MicroSystems |
7 / 12 page 3425 DUAL, CHOPPER-STABILIZED, ULTRA-SENSITIVE, BIPOLAR HALL-EFFECT SWITCH www.allegromicro.com 7 FUNCTIONAL DESCRIPTION Chopper-Stabilized Technique. These devices use a proprietary dynamic offset cancellation technique, with an internal high-frequency clock to reduce the residual offset voltage of the Hall element that is normally caused by device overmolding, temperature dependencies, and thermal stress. 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 will also slightly degrade the device output repeatability. The Hall element can be considered as a resistor array similar to a Wheatstone bridge. A large portion of the offset is a result of the mismatching of these resistors. The chopper-stabilizing technique cancels the mismatch- ing of the resistors by changing the direction of the current flowing through the Hall plate and Hall voltage measure- ment taps, while maintaining the Hall-voltage signal that is induced by the external magnetic flux. The signal is, then, captured by a sample-and-hold circuit. More detailed descriptions of the circuit operation can be found in: Technical Paper STP 97-10, Monolithic Magnetic Hall Sensor Using Dynamic Quadrature Offset Cancellation and Technical Paper STP 99-1, Chopper- Stabilized Amplifiers With A Track-and-Hold Signal Demodulator. Operation. The output of these devices switches low (turns on) when a magnetic field perpendicular to the Hall sensor exceeds the operate point threshold (BOP). After turn-on, the output is capable of sinking 30 mA and the output voltage is VOUT(SAT). When the magnetic field is reduced below the release point (BRP), the device output switches high (turns off). Note especially that release can occur when the magnetic field is removed but to ensure release, a field reversal is required. The difference in the magnetic operate and release points is the hysteresis (Bhys) of the device. This built-in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. Dwg. EH-012 REG X +V HALL VOLTAGE B + — Dwg. AH-011-2 0 +B 0 FLUX DENSITY Dwg. GH-034-5 -B RP B VOUT(SAT) CC V OP B +V |
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