Analog GMR sensors

NVE's AA and AB Series analog GMR sensors offer unique and unparalleled magnetic sensing capabilities. These sensors are characterized by high sensitivity to applied magnetic fields, excellent temperature stability, low power consumption, and small size. These characteristics make them suitable for use in a wide variety of applications, from rugged industrial and automotive position, speed, and current sensors, to low voltage, battery-powered sensors for use in hand-held instrumentation and implantable medical devices. The unmatched versatility of these basic magnetic sensors makes them an excellent choice for a wide range of analog sensing applications.

GMR sensor technology - NVE

Generalities

The AA series sensors use NVE's patented GMR materials and on-chip flux concentrators to provide a directionally sensitive output signal. These sensors are sensitive in one direction in the plane of the IC, with a cosine-scaled falloff in sensitivity as the sensor is rotated away from the sensitive direction. Also, these devices provide the same output for magnetic fields in the positive or negative direction along the axis of sensitivity (omnipolar output). All sensors are designed in a Wheatstone bridge configuration to provide temperature compensation. Two packages are offered, an SOIC8 and an MSOP8. These sensors are also available in die form on a special order basis.

Three families of NVE's basic AA series sensors are offered : the standard AA series, the AAH series, and the AAL series. Each of these sensor families uses a different GMR material, with its own characteristics.

  AA AAH AAL
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


The AB series sensors are differential sensor devices, or gradiometers, which take advantage of the high output characteristics of NVE's GMR materials. Two families of AB sensors are offered: the standard AB series, and the ABH series. They have operational characteristics similar to the AA and AAH sensors described in the table above, but with the bipolar linear output characteristics of a differential sensor.

Kits and documentations

AG001-01 - Analogous sensors
The kit contains several references among the AA and AB series and a choice of magnets of polarization and PCB. It also contains application notes CDROM and a catalogue.

Analog GMR sensors documentation (En)

GMR catalog (En)

Evaluation kits (En)