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