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ADA4571: Integrated AMR Angle Sensor and Signal Conditioner Data Sheet

ADA4571: Integrated AMR Angle Sensor and Signal Conditioner Data Sheet
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ADA4571: Integrated AMR Angle Sensor and Signal Conditioner Data Sheet - 1

FUNCTIONAL BLOCK DIAGRAM VDD 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-Δ 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 TEMPERATURE SENSOR BRIDGE DRIVER 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 FAULT DETECTION Data Sheet Integrated AMR Angle Sensor and Signal Conditioner ADA4571 GENERAL DESCRIPTION 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). COMPANION PRODUCTS ADCs: AD7265, AD7266, AD7866, AD7902 Microconverter: ADuCM360 Current Sense Amplifier: AD8418A Voltage Regulator Design Tool: ADIsimPower Additional companion products on the ADA4571 product page 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. The ADA4571 is available in an 8-lead SOIC package. 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 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 registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2014 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com

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ADA4571: Integrated AMR Angle Sensor and Signal Conditioner Data Sheet - 2

Data Sheet REVISION HISTORY 10/14—Revision 0: Initial Version

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ADA4571: Integrated AMR Angle Sensor and Signal Conditioner Data Sheet - 3

Data Sheet SPECIFICATIONS MAGNETIC CHARACTERISTICS Table 1. Parameter Magnetic Field Strength, HEXT Maximum Magnetic Field Rotational Frequency Reference Position Error Reference Angle Error Test Conditions/Comments The stimulating magnetic field in the x-y sensor plane necessary to ensure the minimum error as specified in Table 1 and Table 2 Reference position for y = 0 µm is the straight connection line of Pin 2 and Pin 7; the x = 0 µm position is referred to the middle distance of the package top Reference position for angle Φ = 0° is parallel to the straight connection line of Pin 2 and...

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ADA4571: Integrated AMR Angle Sensor and Signal Conditioner Data Sheet - 4

ADA4571 Parameter Power Supply Rejection3 Output Short-Circuit Current Sensitivity POWER SUPPLY Supply Voltage Quiescent Supply Current Power-Up Time DIGITAL INPUTS Input Bias Current (GC) Input Bias Current (PD) Input Voltage (GC and PD) High Low TEMPERATURE SENSOR Error Over Temperature Temperature Voltage Range Temperature Coefficient VTEMP Output Voltage VTEMP Output Impedance VTEMP Load Capacitance VTEMP Short-Circuit Current LOAD CAPACITOR External Load Capacitance Data Sheet Symbol PSRR ISC SEN VDD ISY IB_GC IB_PD Test Conditions/Comments Measured as output variation from VDD/2, VDD...

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ADA4571: Integrated AMR Angle Sensor and Signal Conditioner Data Sheet - 5

Data Sheet ADA4571B −40°C ≤ TA ≤ +125°C, VDD = 2.7 V to 5.5 V, CL = 10 nF to GND, RL = 200 kΩ to GND; angle inaccuracies referred to homogenous magnetic field of 25 kA/m; output signals and offset voltages are related to the common-mode level of VDD/2, unless otherwise stated. Table 3. Parameter ANGULAR PERFORMANCE Angle Measurement Range Uncorrected Angular Error1 Test Conditions/Comments Output Voltage Range Output Voltage Low Output Referred Offset Voltage Amplitude Synchronism Error6 Delay Time Phase Error7 Orthogonality Error3 Output Noise Output Series Resistance k tDEL ΦERR OE VNOISE...

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ADA4571: Integrated AMR Angle Sensor and Signal Conditioner Data Sheet - 6

ADA4571 Parameter DIGITAL INPUTS Input Bias Current (GC) Input Bias Current (PD) Input Voltage (GC and PD) High Low TEMPERATURE SENSOR Error Over Temperature Temperature Voltage Range Temperature Coefficient VTEMP Output Voltage VTEMP Output Impedance VTEMP Load Capacitance VTEMP Short-Circuit Current LOAD CAPACITOR External Load Capacitance Data Sheet Symbol Test Conditions/Comments For GC mode control pin, GC = GND For GC mode control pin, GC = VDD For PD pin, PD = GND For PD pin, PD = VDD TA = 25°C Buffered output Optional load capacitance Short-circuit to VDD or GND Between VSIN to GND...

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ADA4571: Integrated AMR Angle Sensor and Signal Conditioner Data Sheet - 7

Data Sheet ABSOLUTE MAXIMUM RATINGS Operating Temperature Storage Temperature Output Short-Circuit Duration to GND orVDD Human Body Model (HBM)2 Charge Device Model (CDM)4 4 Applicable standard: ESDA/JEDEC JS-001 -2011. Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operating conditions for extended periods may affect...

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