Data Sheet ADA4570 Integrated AMR Angle Sensor and Signal Conditioner with Differential Outputs FEATURES FUNCTIONAL BLOCK DIAGRAM Contactless angular measurement High precision 180 angle sensor Typical angular error of 0.1 Low output noise of 850 V rms Sine and cosine differential outputs Ratiometric analog voltage outputs Negligible hysteresis SAR or - ADC compatible Temperature compensated AMR bridge Industrial temperature range: 40C to +125C Automotive temperature range: 40C to +150C EMI resistant Fault diagnostics V from 2.7 V to 5.5 V DD Minimal phase error of 0.85 at 30,000 rpm AEC-Q100 qualified for automotive applications Figure 1. Single chip solution GENERAL DESCRIPTION Available in an 8-lead SOIC package The ADA4570 is an anisotropic magnetoresistive (AMR) sensor APPLICATIONS with integrated signal conditioning amplifiers and analog-to-digi- tal converter (ADC) drivers. The ADA4570 produces two differen- Absolute position measurement (linear and angle) tial analog outputs that indicate the angular position of the sur- Brushless dc motor control and positioning rounding magnetic field. Actuator control and positioning The ADA4570 consists of two die within one package, an AMR sen- Contactless angular measurement and detection sor, and a fixed gain instrumentation amplifier. The ADA4570 de- Magnetic angular position sensing livers amplified differential cosine and sine output signals, with respect to the angle, when the magnetic field is rotating in the x-axis and the y-axis (x-y) plane. 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 complete rotation of a dipole magnet produces two periods on the sinusoidal outputs. Therefore, the magnetic angle () calculated from the SIN and COS differential outputs represents the physical orientation of the magnet with respect to the ADA4570 in the 0 to 180 measurement range. Within a homogeneous field in the x-y plane, the output signals of the ADA4570 are independent of the physical placement in the z direction (air gap). The ADA4570 is available in an 8-lead SOIC package. Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliableas i. However, no responsibility is assumed by Analog DOCUMENT FEEDBACK Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and TECHNICAL SUPPORT registered trademarks are the property of their respective owners.Data Sheet ADA4570 TABLE OF CONTENTS Features................................................................ 1 Applications Information...................................... 11 Applications........................................................... 1 Supply and ADC Reference............................. 11 Functional Block Diagram......................................1 Connecting the ADA4570.................................11 General Description...............................................1 Angle Calculation..............................................11 Specifications........................................................ 3 Signal Dependence on Air Gap Distance ........11 Absolute Maximum Ratings...................................5 Signal Offset and Calibration............................11 Electrostatic Discharge (ESD) Ratings...............5 VTEMP Output Pin ..........................................12 Thermal Resistance........................................... 5 Power Consumption ........................................12 ESD Caution.......................................................5 Diagnostic.........................................................12 Pin Configuration and Function Descriptions........ 6 Outline Dimensions............................................. 13 Typical Performance Characteristics.....................7 Ordering Guide.................................................13 Terminology........................................................... 9 Automotive Products........................................ 14 Theory of Operation.............................................10 REVISION HISTORY 7/2021Revision 0: Initial Version analog.com Rev. 0 2 of 14