Integrated AMR Angle Sensor and Signal Conditioner Data Sheet ADA4571 FEATURES FUNCTIONAL BLOCK DIAGRAM VDD High precision 180 angle sensor Maximum angular error of 0.5 ADA4571 TEMPERATURE SENSOR VTEMP Analog sine and cosine outputs Ratiometric output voltages BRIDGE DRIVER GC Low thermal and lifetime drift SAR or - analog-to-digital converter (ADC) drive capable Magnetoresistive (MR) bridge temperature compensation mode + Temperature range: 40C to +150C EMI VSIN DRIVER G = 40 FILTER EMI resistant Fault diagnostics V from 2.7 V to 5.5 V DD AMR BRIDGE BIAS OSCILLATOR FAULT DETECTION SENSORS Minimum phase delay Qualified for automotive applications Available in an 8-lead SOIC package + EMI DRIVER G = 40 VCOS FILTER APPLICATIONS Absolute position measurement (linear and angle) Brushless dc motor control and positioning Actuator control and positioning GND GND PD Contactless angular measurement and detection Figure 1. Magnetic angular position sensing GENERAL DESCRIPTION The ADA4571 is an anisotropic magnetoresistive (AMR) sensor COMPANION PRODUCTS with integrated signal conditioning amplifiers and ADC drivers. ADCs: AD7265, AD7266, AD7866, AD7902 The ADA4571 produces two analog outputs that indicate the Microconverter: ADuCM360 angular position of the surrounding magnetic field. Current Sense Amplifier: AD8418A The ADA4571 consists of two die within one package, an AMR Voltage Regulator Design Tool: ADIsimPower sensor, and a fixed gain (G = 40 nominally) instrumentation Additional companion products on the ADA4571 product page amplifier. The ADA4571 delivers clean and amplified cosine PRODUCT HIGHLIGHTS and sine output signals related to the angle of a rotating 1. Contactless angular measurement. magnetic field. The output voltage range is ratiometric to the 2. Measures magnetic field direction rather than field intensity. supply voltage. 3. Minimum sensitivity to air gap variations. The sensor contains two Wheatstone bridges, at a relative angle 4. Large working distance. of 45 to one another. A rotating magnetic field in the x-y 5. Excellent accuracy, even for weak saturation fields. sensor plane delivers two sinusoidal output signals with the 6. Minimal thermal and lifetime drift. double frequency of the angle () between sensor and magnetic 7. Negligible hysteresis. field direction. Within a homogeneous field in the x-y plane, 8. Single chip solution. 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. Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2014 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 12514-001ADA4571 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configuration and Descriptions ...............................................8 Applications ....................................................................................... 1 Typical Performance Characteristics ..............................................9 Functional Block Diagram .............................................................. 1 Terminology .................................................................................... 13 General Description ......................................................................... 1 Theory of Operation ...................................................................... 14 Companion Products ....................................................................... 1 Application Information ................................................................ 16 Product Highlights ........................................................................... 1 Angle Calculation ....................................................................... 16 Revision History ............................................................................... 2 Connection to ECU ................................................................... 16 Specifications ..................................................................................... 3 Mechanical Tolerances Diagrams ............................................ 18 Magnetic Characteristics ............................................................. 3 Diagnostics .................................................................................. 19 Electrical Characteristics ............................................................. 3 Outline Dimensions ....................................................................... 21 Absolute Maximum Ratings ............................................................ 7 Ordering Guide .......................................................................... 21 Thermal Resistance ...................................................................... 7 Automotive Products ................................................................. 21 ESD Caution .................................................................................. 7 REVISION HISTORY 10/14Revision 0: Initial Version Rev. 0 Page 2 of 21