A1373

The A1373 and A1374 high precision linear Hall effect sensors are  sensitive, tem- perature stable, linear devices with externally programmable features. This device  family incorporates a chopper-stabilized amplifier, voltage regulator, program- ming logic, and an output amplifier on a single IC. The patented dynamic offset  cancellation used with a chopper-stabilization technique provides extremely low  offset and minimal temperature drift. A high frequency clock is used for chopping,  to ensure high frequency signal processing capability. The A1373 and A1374 are  ideal for use in automotive and industrial linear position-sensing applications that  require increased reliability and accuracy over conventional contacting-potentiom- eter solutions.  Key applications include: throttle position sensors, pedal position  sensors, and suspension height sensors.

The design and manufacturing flexibility of the A1373 and A1374 complement  the Allegro linear Hall effect family of devices by offering programmable gain,  quiescent offset voltage for unipolar or bipolar operation, temperature coef- ficient, clamps, and polarity.  The device can be set up in a magnetic circuit  and programmed with a train of serial pulses via the output pin.  Once the right  combination of gain, quiescent output voltage, and temperature coefficient has  been selected, the codes can be locked for one-time programming. In this manner,  manufacturing tolerances can be reduced and the assembly process can be simpli- fied.