The AMR4020 series magnetic grate sensors integrate two push-pull Wheatstone bridges, each of which contains four high-sensitivity anisotropic magnetoresistance (AMR) sensing elements. Such a design effectively compensates temperature drift to ensure high accuracy under wide temperature range.

As the AMR4020 moves along the magnetic scale, sensor outputs two orthogonal sets of analog voltage signals (sine and cosine), the period of which corresponds to the scale’s magnetic pole pitch. The relative displacement of the sensor and the scale can be accurately determined by calculating the two sets of analog voltage signals. The AMR4020 series have been designed with internal sensor elements close to the surface of the package to reduce limitations on airgap. Combined with the already small DFN12L (6mm × 2mm × 0.75mm) package, the AMR4020 series give greater responsibility to system design and ease of assembly in tight spaces.

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Applications