AG920-07E NVE, AG920-07E Datasheet - Page 122

• Manufacturer Part Number: AG920-07E
• Description: KIT EVALUATION GT SENSOR
• Manufacturer: NVE

Specifications of AG920-07E

• Sensor Type: Magnetic. GMR (Giant Magnetoresistive)
• Interface: Analog
• Embedded: No
• Utilized Ic / Part: ABL & AKL Series GT Sensors
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Sensitivity: -
• Sensing Range: -
• Other names: 391-1063

Note that although a permanent magnet was used for biasing in these experiments, a better method is to
use a constant current. The current can be run on a trace parallel to the trace to be sensed, and will add
to the current of interest. The magnetic field from the bias current can be more closely controlled than
the field from a permanent magnet, which varies substantially with distance from the sensor. In
addition, provided the bias current is stable over temperature, the bias field at the sensor element will
also be stable over temperature. Permanent magnets often have large temperature coefficients, leading
to biasing changes with temperature.
The sensor that was used to take this data was supplied with 8.06V. The marks on the graph are output
error bars that cover the expected error from this part due to the part’s intrinsic hysteresis and
measurement errors. The current was swept from zero to 100 mA and back to zero multiple times. In
this biased state, the sensor is extremely linear and hysteresis is low. A weighed linear fit shows a
-29.19 ± 0.08 mV/A correlation with 8.06V supplied which results in a sensitivity of 3.70 ± 0.01
mV/V/A.
154.5
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0
AA003-02 over single 0.010" wide
mV Out = -29.19 ± 0.08(A)
0.02
0.0023" thick trace
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0.04
Current (A)
- 122 -
0.06
@8.06V
0.08
Application Notes
0.1