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AA and AB-Series Analog Sensors GMR Sensors Download this section only (.pdf)
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Quick Reference Guide

NVE's AA and AB-Series analog GMR sensors have high sensitivity, excellent temperature stability, low power consumption, and small size. Their unmatched versatility make them an excellent choice for a wide range of analog sensing applications from rugged industrial and automotive position, speed, and current sensors to low voltage, battery-powered sensors for handheld instrumentation, and implantable medical devices.

AA-Series sensors use NVE's patented GMR materials and on-chip flux concentrators to provide a directionally-sensitive output. These sensors are sensitive in one direction in the plane of the IC, with a cosine-scaled fall-off in sensitivity as the sensor is rotated away from the sensitive direction. These devices provide omnipolar output, that is the same output for magnetic fields in the positive or negative direction along the axis of sensitivity. All sensors use a temperature compensating Wheatstone bridge configuration. SOIC8 and MSOP8 packages are offered, and the sensors are also available in die form by special order.

Three families of NVE's AA-Series sensors are available: the standard AA-Series; the AAH-Series; and the AAL-Series. The families use different GMR materials as summarized in the following table:

AA-Series
AAH-Series
AAL-Series
 Sensitivity to Applied Fields 
High
Very High
High
Field Range of Operation 
High
Low
Medium
Hysteresis 
Medium
High
Low
Temperature Range 
High
Very High
Very High

AB-Series sensors are differential devices, or gradiometers, utilizing the high sensitivity of NVE's GMR materials. Two families of AB sensors are offered: the standard AB-Series and the high-sensitivity ABH-Series. They have operational characteristics similar to the AA and AAH sensors described above, but with the bipolar linear output characteristics of a differential sensor.

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