AG920-07 NVE, AG920-07 Datasheet - Page 99

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

Specifications of AG920-07

• Sensor Type: Magnetic. GMR (Giant Magnetoresistive)
• Interface: Analog
• Embedded: No
• Utilized Ic / Part: ABL & AKL Series GT Sensors
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Supply: -
• Sensitivity: -
• Sensing Range: -
• Other names: 391-1022

Signal Conditioning Circuits
A number of methods exist for pre-amplification of an NVE GMR bridge sensor output. This section
shows some representative circuits and compares the relative advantages and disadvantages of some
common configurations. The circuits shown were designed for low power and 5V operation. Low
noise or high performance applications should be designed with lower noise, higher performance
components.
Operational Amplifier (Op Amp) Bridge Preamplifier Circuits
Single Op Amp Bridge Amplifier
The figure below shows a simple circuit for amplifying an NVE AAxxx-02 GMR Magnetic Field
Sensor’s bridge output using a single 5V supply. The advantages of this configuration are simplicity,
low component count, and low cost.
8 Vin+
4 Vin-
+5V
www.nve.com
C1 0.1uF
S
1 Vout-
5 Vout+
INGLE
O
P
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R3
A
MP
R1
Vref
P
- 99 -
REAMPLIFIER
R4
2 -
3 +
LMC7101A/NS
+5V
U2
R2
7 V+
4 V-
C
Application Notes
C2 0.1uF
IRCUIT
6
Vout