AB Sensors
- 25 -
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General Characteristics:
Parameter Min Typical Max Unit
Input Voltage Range <1
4
±12.5
4
Volts
Operating Frequency DC >1 MHz
Operating Temperature Range -50 125
°C
Bridge Electrical Offset -4 +4 mV/V
Signal Output at Max. Field 120 mV/V
Nonlinearity 2 % (unipolar)
5
Hysteresis 4 % (unipolar)
5
TCR +0.14
% / °C
6
TCOI +0.03
% / °C
6
TCOV -0.1
% / °C
6
Off Axis Characteristic
Cos β
7
ESD Tolerance 400 V pin-to-pin HBM
Notes:
1. 1 Oersted (Oe) = 1 Gauss in air.
2. See the Appendix for package dimensions and tolerances.
3. Sensors can be provided in die form by special request.
4. GMR A
B-Series sensors are pure ratiometric devices, meaning that they will operate properly at extremely low supply
voltages
. The output signal will be proportional to the supply voltage. Maximum voltage range is limited by the power
dissipation in the package and the maximum operating temperature of the sensor.
5. Unipolar operation means exposure to magnetic fields of one polarity, e.g., 0 to 30 Gauss, or -2 to -50 Gauss, but not -20
to +30 Gauss (bipolar operation)
. Bipolar operation will increase nonlinearity and hysteresis.
6. TCR is resistance change with temperature with no applied field
. TCOI is the output change with temperature using a
constant current source to power the sensor
. TCOV is the output change with temperature using a constant voltage source
to power the sensor.
7. Beta (β) is any angle deviation from the sensitive axis.
The Figure at left is a
simulated output from an
NVE Gradiometer. The
output / gradient
correlation shown
assumes one pair of
resistors is held at zero
field. Note the bipolar
output.
Typical Gradiometer Transfer Function
-50
-40
-30
-20
-10
0
10
20
30
40
50
-400 -200 0 200 400
Magnetic Field Applied to Resistors
Differential Voltage Out of Sensor (mV)
Increasing field
on X resistors
Increasing field
on Y resistors
