DISCONTINUED: This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: September 29th, 2023.
Recommended substitution: For existing customer transition, and for new customers or new applications, contact Allegro Sales.
The A1357 device is a high precision, programmable two-wire
Hall-effect linear sensor IC with a pulse width modulated
(PWM) current. The A1357 device converts an analog signal
from its internal Hall sensor element to a digitally encoded
PWM signal. The coupled noise immunity of the digitally
encoded PWM is far superior to the noise immunity of an
analog output signal.
The BiCMOS, monolithic circuit inside of the A1357 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 that is normally
caused by device overmolding, temperature dependencies,
and thermal stress. The high frequency offset cancellation
(chopping) clock allows for a greater sampling rate, which
increases the accuracy of the output current signal and results
in faster signal processing capability.
The A1357 sensor is provided in a lead (Pb) free 3-pin single
inline package (KB suffix), with 100% matte tin leadframe
plating.
