Features and Benefits
- High precision 180° angle sensor
- Maximum angular error of 0.5°
- Analog sine and cosine outputs
- Ratiometric output voltages
- Low thermal and lifetime drift
- SAR or Σ-∆ analog-to-digital converter (ADC) drive capable
- Magnetoresistive (MR) bridge temperature compensation mode
- Temperature range: −40°C to +150°C
- EMI resistant
- Fault diagnostics
- VDD from 2.7 V to 5.5 V
- Minimum phase delay
- Qualified for automotive applications
- Available in an 8-lead SOIC package
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
Markets and Technologies
Product Lifecycle Recommended for New Designs
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.
Evaluation Kits (1)
The EV-ADA4571RSDZ evaluation board features the ADA4571
in an end of shaft magnet configuration.
The evaluation kit is composed of an ADA4571 motherboard, a magnetic stimulus on a hand turnable mount, a USB interface, and an SDP-S controller board. The required LabVIEW 2015
graphical user interface (GUI) software for Windows® is available for download from the EV-ADA4571RSDZ product page.
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.
Tools & Simulations
vLab: Magnetics Application
The Magnetics app allows you to model and simulate the function of Analog Devices' anisotropic magnetoresistive (AMR) technologies. This application allows you to generate your own simulation results in various output forms. The properties of the magnet, as well as its position with respect to the sensor may be customised for your system.
Reference Designs (1)
3rd Party Solutions (1)
Solutions Bulletins & Brochures (1)
Circuit Note (1)
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.