The sensors in the AA700 family are FreePitch sensors based on the anisotropic MagnetoResistive (AMR) effect.
The sensors consist of two Wheatstone measuring bridges at an angle of 45° to each other. A rotating magnetic field (e.g. a dipolar magnet) at the sensor level supplies two signals with a phase shift of 90° relative to each other (sine and cosine) with double the frequency of the magnetic field.
All sensors from the AA700 family feature PerfectWave technology and provide extremely low harmonic output signals.
The sensors are available in various processing variants. As bare-die, the sensors can be fitted directly using chip-on-board technology. The SO8 housing is suitable for applications at the shaft end and can be easily fitted on a PCB. The special SIL6 and LGA6 package allows SMD assembly, but can be fitted to a PCB edge - this enables small distances between the sensor and the measurement scale in the application.
The AA745 FreePitch sensor is available as an automotive qualified component in the SO8 housing for SMD assembly.
The sensor is distinguished by its electrically isolated bridges for sine and cosine signals. The sensor is optimized for the typical application of measuring with a dipolar magnet at the shaft end.
Sensitec is increasing the sensor efficiency by means of various design modifications to the chip layout. The patented solutions, described more closely below, also contribute to better signal quality, reduced sensitivity to stray fields and increased control accuracy.