AG920-07E NVE, AG920-07E Datasheet - Page 93

• 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

Application Notes
Also important to note regarding hysteresis is that it scales with the applied magnetic field. For
applications where the magnetic field variations are small, hysteresis is small. The following diagram
illustrates this point:
Voltage
Output Follows This
Output
Curve from Positive
Saturation Field Back
to Zero
Output Follows This
Curve from Zero to
Positive Saturation
Field
- Applied Field
+ Applied Field
The enlarged area on the left shows the outer boundaries of the sensor hysteresis loop when it is
operated in unipolar mode (positive magnetic fields only). Inside the outer boundaries is the sensor
behavior if it is exposed to small but increasing magnetic fields. For example, if this was the
characteristic of an AA002-02 sensor, the magnetic field history for the characteristic between the
boundaries might start at 6 Gauss, then go to 6.5, then 5.5, then 7, then 7.5, and so forth. The curvature
of the lines between the boundaries is exaggerated for clarity. The diagram shows that for small
variations of the magnetic field, the hysteresis is also small, and as the variations in field increase, so
does the hysteresis.
Sensor hysteresis presents challenges in some applications, but in most cases the sensor elements can
be used to advantage despite the hysteresis characteristics.
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