Integrated AMR Angle Sensor and Signal Conditioner
The ADA4571 is an anisotropic magnetoresistive (AMR) sensor with integrated signal conditioning amplifiers and ADC drivers. The ADA4571 produces two analog outputs that indicate the angular position of the surrounding magnetic field.
The ADA4571 consists of two die within one package, an AMR sensor, and a fixed gain (G = 40 nominally) instrumentation amplifier. The ADA4571 delivers clean and amplified cosine and sine output signals related to the angle of a rotating magnetic field. The output voltage range is ratiometric to the supply voltage.
The sensor contains two Wheatstone bridges, at a relative angle of 45° to one another. A rotating magnetic field in the x-y sensor plane delivers two sinusoidal output signals with the double frequency of the angle (α) between sensor and magnetic field direction. Within a homogeneous field in the x-y plane, the output signals are independent of the physical placement in the z direction (air gap).
The ADA4571 is available in an 8-lead SOIC package.
- Contactless angular measurement.
- Measures magnetic field direction rather than field intensity.
- Minimum sensitivity to air gap variations.
- Large working distance.
- Excellent accuracy, even for weak saturation fields.
- Minimal thermal and lifetime drift.
- Negligible hysteresis.
- Single chip solution.
- Absolute position measurement (linear and angle)
- Brushless dc motor control and positioning
- Actuator control and positioning
- Contactless angular measurement and detection
- Magnetic angular position sensing
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
The EV-ADA4571RSDZ evaluation board features an on-board 5 V regulator; a 4-channel simultaneous sampling, analog-to-digital converter (ADC); and jumpers for enabling the temperature compensation and power-down modes within the ADA4571. The ADA4571 motherboard also features test points and unpopulated coaxial connectors for the three outputs of the device.
The SDP-S controller board controls the ADC on the ADA4571 motherboard, reading back the ADA4571 outputs to change the digital inputs to the ADA4571, interface with the GUI, and supply power to the evaluation board through the USB connection.
For full details, see the ADA4571 data sheet, which must be used in conjunction with the user guide when using the evaluation board.
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