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Linear Hall-effect sensor targets current, position sensing applications

Worcester, Mass.—Allegro has introduced a high precision, programmable linear Hall-effect sensor with a 125-Hz pulse width modulated (PWM) output that is targeted at the automotive and industrial markets in current and position sensing applications.

The duty cycle (DC) of the PWM output signal is proportional to an applied magnetic field. Allegro's A1351 device converts an analog signal from its internal Hall sensor element to a digitally encoded PWM output signal. A simple RC network can be used to convert the digital PWM signal back to an analog signal.

The BiCMOS, monolithic circuit inside of the A1351 integrates a Hall element, precision temperature-compensating circuitry to reduce the intrinsic sensitivity and offset drift of the Hall element, a small-signal high-gain amplifier, proprietary dynamic offset cancellation circuits, and PWM conversion circuitry. The dynamic offset cancellation circuits reduce the residual offset voltage of the Hall element. An internal filter of approximately 50 Hz is used to achieve ~10 bits of output resolution.

Allegro's A1351 device is supplied in a thin 4-lead SIP (K) package.

Pricing: $1.38 in quantities of 1,000.
Availability: 12 to 14 week typical lead-time to market.
Datasheet: A1351.

Allegro MicroSystems Inc., www.allegromicro.com

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