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Features and Benefits

? High Magnetic Field Tunneling Magnetoresistance (TMR) Technology

? Wide 1 kOe Operating Range Provides Highest Air Gap Insensitivity

? Excellent Immunity to Environmental Magnetic Disturbance

? Large Output Signal Without Amplification

? High Accuracy Dual-Axis 360° Angle Measurement

? Compatible with Wide Range of Supply Voltages

? Fast Response for High-Speed Applications

? Excellent Thermal Stability

? Compact LGA Package

Applications

? Rotary Position Sensors

? Rotary Encoders

? Contactless Potentiometers

? Valve Position Sensors

? Knob Position Sensors

General Description

The output voltages of the dual-axis TMR3003 TMR high-field angle sensor are proportional to the

sine and cosine of the angle of a magnetic field applied parallel to the surface of the TMR3003.

These sine and cosine signals are provided by two orthogonal full bridge TMR angle sensors. Each

full bridge TMR angle sensor includes four unique high-field TMR sensor arms connected in a

push-pull arrangement to produce a best-in-class peak-to-peak signal as large as 90% of the supply

voltage, eliminating the need for amplification in many applications, while maintaining low error as

the magnetic field is varied over a range of 1 kOe. Additionally, the TMR full bridge technology

accurately compensates the output against changes in ambient temperature. This sensor is

assembled in a compact LGA8 package of 3.0 mm ? 3.0 mm ? 0.9 mm.

Operation

A small dipolar magnet, placed above the TMR3003, can provide a magnetic field in any desired

orientation parallel to the plane of the TMR3003 package. The magnetic field is detected by the

TMR sensors in the TMR3003 which are comprised of two ferromagnetic layers. One layer is a

“pinned layer” that is not affected by the magnetic field, and the other is “free layer,” which has a

magnetization that aligns parallel to the applied magnetic field. Because the TMR effect produces a

resistance that is proportional to the sine or cosine of the relative difference between the free and

pinned layer magnetization orientations, the sensor output voltage is sinusoidally dependent on the

angle of the applied magnetic field, thereby providing a true 360° measure of the orientation of the

magnetic field.