Integrated AMR Angle Sensor and Signal Conditioner Data Sheet ADA4571-2 FEATURES FUNCTIONAL BLOCK DIAGRAM GND1 GND1 VDD1 High precision, 2-channel, isolated AMR angle sensor for redundant systems VTEMP1 TEMPERATURE SENSOR ADA4571-2 Angular range of 0 to 180 Typical angular error of 0.1 BRIDGE DRIVER GC1 Analog sine and cosine outputs per channel Ratiometric output voltages Low thermal and lifetime drift + Successive approximation register (SAR) analog-to-digital EMI VSIN1 DRIVER G = 40 FILTER converter (ADC) or - ADC drive capable Magnetoresistive (MR) bridge temperature compensation mode Temperature range: 40C to +150C AMR BRIDGE BIAS OSCILLATOR FAULT DETECTION SENSORS Supply voltage (V ) from 3 V to 5.5 V DD Minimum phase delay Available in a 16-lead SOIC package + EMI Qualified for automotive applications DRIVER G=40 VCOS1 FILTER APPLICATIONS PD1 Permanent magnet synchronous motor (PMSM) control and VTEMP2 TEMPERATURE SENSOR positioning Contactless angular measurement and detection BRIDGE DRIVER GC2 Magnetic angular position sensing + EMI VSIN2 DRIVER G = 40 FILTER GENERAL DESCRIPTION AMR BRIDGE FAULT DETECTION The ADA4571-2 is a 2-channel anisotropic magneto resistive BIAS OSCILLATOR SENSORS (AMR) sensor with integrated signal conditioning amplifiers and ADC drivers. The device produces analog outputs that + indicate the angular position of the surrounding magnetic field. EMI DRIVER G=40 VCOS2 FILTER Each channel consists of two die within one package: an PD2 AMR sensor and a variable gain instrumentation amplifier. The ADA4571-2 delivers clean and amplified cosine and sine output signals per channel related to the angle of a rotating magnetic GND2 GND2 VDD2 field. The output voltage range is ratiometric to the supply voltage. Figure 1. Each sensing channel contains two separated wheatstone PRODUCT HIGHLIGHTS bridges at a relative angle of 45 to one another. A rotating 1. Contactless angular measurement. magnetic field parallel to the plane of the IC package delivers 2. Measures magnetic field direction rather than field intensity. two sinusoidal output signals, with the double frequency of the 3. Minimum sensitivity to air gap variations. angle, , between the sensor and the magnetic field direction. 4. Large working distance. Within a homogeneous field parallel to the plane of the IC package, 5. Excellent accuracy, even for weak saturation fields. the output signals are independent of airgap between the sensor 6. Minimal thermal and lifetime drift. and the magnet. 7. Negligible hysteresis. The ADA4571-2 is available in a 16-lead SOIC package. 8. Single-chip solution. 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 2016 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 15015-001ADA4571-2 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configuration and Function Descriptions ..............................6 Applications ....................................................................................... 1 Typical Performance Characteristics ..............................................7 General Description ......................................................................... 1 Theory of Operation .........................................................................9 Functional Block Diagram .............................................................. 1 Applications Information .............................................................. 11 Product Highlights ........................................................................... 1 Angle Calculation ....................................................................... 11 Revision History ............................................................................... 2 Connection to ECU ................................................................... 11 Specif icat ions ..................................................................................... 3 Diagnostics .................................................................................. 12 Magnetic Characteristics ............................................................. 3 Outline Dimensions ....................................................................... 13 Electrical Characteristics ............................................................. 3 Ordering Guide .......................................................................... 13 Absolute Maximum Ratings ............................................................ 5 Automotive Products ................................................................. 13 Thermal Resistance ...................................................................... 5 ESD Caution .................................................................................. 5 REVISION HISTORY 11/2016Revision 0: Initial Version Rev. 0 Page 2 of 13