Analog Devices’Magnetic Angle Sensor Technology Delivers Industry’s Highest Performance for Precision DC Motor Controls

ADI’s ADA4571 sensor directly measures the shaft positionin brushless DC motors, reducing noise and optimizing motor smoothness and torque in automotive and industrial applications.  

Analog Devices, Inc.(NASDAQ: ADI)introduced today the industry’s highest precision, highest speed magnetic angle sensor.The high-resolution ADA4571 sensor is four times more accurate (0.5° max), 60 percent faster and uses 40 percent less power than competing angle sensors.

The ADA4571directly measures motor position to reduce noise, optimize smoothness and torque performance, and helps designers of brushless DC (BLDC) motors meet tighter environmental, noise and energyrequirements. The new sensor is automotive qualified andintegrates a custom, mixed-signal signal conditioning IC and sensing element based on anisotropic magneto-resistive (AMR) technology.The new sensorenables direct, non-contact and wear-free angle measurement in a range of motor applications, including automotive systems such as electric power-assisted steering, braking, active suspension and stability control.

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The integrated AMR and precision signal conditioning technology allows the ADA4571 to operate independently of magnet drifts due to lifetime, thermal influencesor mechanical stress, which enables high-accuracy readouts in harshenvironments.

High-accuracy position feedback information enables more effective commutation of the motor and bettercontrol of torque and speed performance especially in low RPM applications. The new sensor alsoenables high-speed motor operation up to 50,000 RPM while the direct angle measurement principle reducesthe effects of vibrationand noise that can degrade motor performance.Better torque control improves motor efficiency, lowers emissions and heat, and extends operating life. Additionally, the low-phase delay (2µs) enables fast-closed-loop control and improves responsivenessin high-dynamic applications such as industrial servo motors,robotics and electric power steering.

The ADA5471 runs on a 2.7- to 5.5-V supply, consumes just 6.5-mA of power, and includes a low-powersleep mode that expands application usage to remotely-poweredsystems.Additionally, the sensor sustains no damageunder high-magnetic-field conditions and has negligible hysteresis; while the low temperature and lifetime-drift performance reduces or eliminates the need for calibration. The sensor also supports advanced diagnostics for use in high-availability and safety-critical applications.

ADA4571 Magnetic Angle SensorKey Features

  • Low angular error: 0.5° max
  • High speed: 50,000 RPM with a 2µsphase delay
  • Low noise: 500uVrms
  • Low power: 6.5 mA
  • -40°C to 150°C operation

Pricing and Availability



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About Analog Devices

Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of electronic equipment. Celebrating over 40 years as a leading global manufacturer of high-performance integrated circuits used in analog and digital signal processing applications, Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices' is included in the S&P 500 Index.


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