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Programmable Hall IC has low profile
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01/03/2007
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Allegro MicroSystems’ A138X family of Hall-effect sensor ICs are programmable, analogue-output devices in low profile surface-mount packages.
The latest applications for linear output Hall sensors, such as displacement, angular position and current measurement, require high accuracy and small package size. The A138x family has been designed to that brief.
Each device is a BiCMOS monolithic circuit which integrates a Hall element, temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain amplifier, a clamped low-impedance output stage and proprietary dynamic offset cancellation technique circuitry.
These sensitive, temperature-stable ratiometric sensors provide a voltage output proportional to the applied magnetic field. The quiescent output voltage is user adjustable around 50% of the supply voltage and the output sensitivity is amendable around four nominal options: 2.5mV/G, 3.125mV/G, 5.0mV/G and 7.5mV/G.
Accuracy is enhanced via programmability on the output pin for end-of-line optimisation without the cost of a fully programmable device.
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Author
Roger Bishop
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