AG911-07 NVE, AG911-07 Datasheet - Page 100

• Manufacturer Part Number: AG911-07
• Description: KIT EVALUATION GMR SWITCH
• Manufacturer: NVE

Specifications of AG911-07

• Sensor Type: Magnetic. GMR (Giant Magnetoresistive)
• Interface: Analog
• Embedded: No
• Utilized Ic / Part: AD Series Switches
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Supply: -
• Sensitivity: -
• Sensing Range: -
• Other names: 391-1021

The equation for the amplified voltage is:
Assuming R
This type of amplifier has two significant limitations in that;
1) the feedback resistors load the output of the NVE bridge sense resistors,
and
2) the circuit has a poor common mode rejection (CMRR) if the resistor ratios are not ideally matched.
Users of this circuit should be aware of the deficiencies and ensure that the feedback resistors are large
compared to the bridge resistor values and that the bridge supply is stable and free from noise and
ripple. Any pickup on the bridge leads should be minimized through proper layout, filter capacitors,
and/or shielding.
V
out
=



(
V
out
1
+
+ R
)



R
2
1
R
= R
+
2
R
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3
2



+ R



R
4
3
R
+
>> 5K
3
R
4

 −

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(
V
- 100 -
out
−
)



R
R
4
3




 +

V
ref
Application Notes