ALLEGRO A1356LKB-T

The A1356 is a high-precision, programmable, open-drain Hall-effect linear sensor IC with a pulse width modulation (PWM) output. The duty cycle (D) of the PWM output signal is proportional to the applied magnetic field. The A1356 converts the analog signal from an internal Hall element into a digitally encoded PWM output signal. The digitally encoded PWM output offers significantly better immunity to coupled noise than an analog output signal. The BiCMOS monolithic circuit inside the A1356 integrates a Hall element, a precision temperature compensation circuit for reducing the inherent sensitivity and offset drift of the Hall element, a small-signal high-gain amplifier, a proprietary dynamic offset cancellation circuit, and a PWM conversion circuit. The dynamic offset cancellation circuit reduces the residual offset voltage of the Hall element. Hall element offset is typically caused by device injection molding, temperature dependence, and thermal stress. The high-frequency offset cancellation (chopper) clock enables higher sampling rates, improving output signal accuracy and achieving faster signal processing capability. The A1356 sensor is available in a lead-free 3-pin single in-line package (suffix KB) with a 100% matte tin-plated leadframe.

• Simultaneous programming of PWM carrier frequency, quiescent duty cycle, and sensitivity for system optimization
• Factory-programmed sensitivity temperature coefficient and quiescent duty cycle drift
• End-of-line programmable
• Higher noise immunity compared to analog output
• Precise recoverability after temperature cycling
• Output duty cycle clamp provides short-circuit diagnostic capability
• Optional 50% duty cycle calibration test mode at device power-up
• Wide ambient temperature range: -40°C to 150°C
• Mechanical stress resistant
• Advanced chopper stabilization circuitry and differential signal path design for very low output offset level
• Proprietary on-chip filter for high output resolution
• Wide supply voltage operating range: 4.5 to 18V