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 μV rms
► Sine and cosine differential outputs
► Ratiometric analog voltage outputs
► Negligible hysteresis
► SAR or Σ-Δ ADC compatible
► Temperature compensated AMR bridge
► Industrial temperature range: −40°C to +125°C
► Automotive temperature range: −40°C to +150°C
► EMI resistant
► Fault diagnostics
► VDD from 2.7 V to 5.5 V
► Minimal phase error of 0.85° at 30,000 rpm
► AEC-Q100 qualified for automotive applications
► Single chip solution
Figure 1.
GENERAL DESCRIPTION
► Available in an 8-lead SOIC package
The ADA4570 is an anisotropic magnetoresistive (AMR) sensor
with integrated signal conditioning amplifiers and analog-to-digi-
tal converter (ADC) drivers. The ADA4570 produces two differen-
tial analog outputs that indicate the angular position of the sur-
rounding magnetic field.
APPLICATIONS
► Absolute position measurement (linear and angle)
► Brushless dc motor control and positioning
► Actuator control and positioning
The ADA4570 consists of two die within one package, an AMR sen-
sor, and a fixed gain instrumentation amplifier. The ADA4570 de-
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.
► Contactless angular measurement and detection
► Magnetic angular position sensing
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 (α) 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 reliable "as is". 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.
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