Sensors in the AL700 family are FixPitch sensors based on the anisotropic magneto resistive (AMR) effect.
These consist of two Wheatstone bridges displaced in relation to each other. As a result, the sensors are adapted to a fixed pole pitch of the measurement scale. When used at a fitting pole pitch, the sensors generate sine and cosine signals at the output.
All sensors from the AL700 family feature PerfectWave technology and provide extremely low harmonic output signals.
Furthermore, the PurePitch sensor design is predominantly implemented within the AL700 sensor family. The sensors therefore form an average value of the magnetic signals across several poles, without delay or external calculation. This increases the accuracy of the sensor signals as individual errors in measurement scale have less of an impact.
The sensors are available in various processing forms. The sensors are available as bare die for direct assembly using chip on board technology. For SMD assembly on a PCB edge, Sensitec offers sensors in the special SIL6 and LGA6 package.
The LGA6 package provides the benefit that all sensors have identical pinning. It is therefore possible to use different sensors with the same basic layout.
The AL780 FixPitch sensor is available as a component for chip on board processing in the industrial sector. The sensor is also available as a component suitable for SMD assembly in the SIL6 or in the compact LGA6L.
The sensor layout is adapted to a magnetic pole pitch of 5.0 mm (10 mm pole pair). Because of the large pole pitch, this sensor is not implemented in the PurePitch design.
The AL798 FixPitch sensor is available as a component for chip on board processing in the industrial sector. The sensor is also available as a component suitable for SMD assembly in the SIL6 or in the compact LGA6S.
The sensor layout is adapted to a magnetic pole pitch of 1.0 mm (2 mm pole pair). The PurePitch design has been realized across 2 poles. This means that this sensor averages the magnetic position information across 2 poles. Single errors on the measurement scale are largely suppressed.
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.