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
Angular range of 0° to 180°
VTEMP1
GC1
TEMPERATURE SENSOR
BRIDGE DRIVER
ADA4571-2
Typical angular error of 0.1°
Analog sine and cosine outputs per channel
Ratiometric output voltages
Low thermal and lifetime drift
+
Successive approximation register (SAR) analog-to-digital
converter (ADC) or Σ-Δ ADC drive capable
Magnetoresistive (MR) bridge temperature compensation mode
Temperature range: −40°C to +150°C
Supply voltage (VDD) from 3 V to 5.5 V
Minimum phase delay
EMI
FILTER
VSIN1
DRIVER
G = 40
–
AMR BRIDGE
SENSORS
FAULT DETECTION
BIAS
OSCILLATOR
Available in a 16-lead SOIC package
Qualified for automotive applications
+
EMI
FILTER
DRIVER
VCOS1
PD1
G = 40
–
APPLICATIONS
Permanent magnet synchronous motor (PMSM) control and
positioning
Contactless angular measurement and detection
Magnetic angular position sensing
VTEMP2
GC2
TEMPERATURE SENSOR
BRIDGE DRIVER
+
–
EMI
FILTER
VSIN2
DRIVER
G = 40
GENERAL DESCRIPTION
AMR BRIDGE
SENSORS
BIAS
OSCILLATOR
FAULT DETECTION
The ADA4571-2 is a 2-channel anisotropic magneto resistive
(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
FILTER
DRIVER
VCOS2
PD2
G = 40
–
Each channel consists of two die within one package: an
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
field. The output voltage range is ratiometric to the supply voltage.
GND2
GND2
VDD2
Figure 1.
Each sensing channel contains two separated wheatstone
bridges at a relative angle of 45° to one another. A rotating
magnetic field parallel to the plane of the IC package delivers
two sinusoidal output signals, with the double frequency of the
angle, α, between the sensor and the magnetic field direction.
Within a homogeneous field parallel to the plane of the IC package,
the output signals are independent of airgap between the sensor
and the magnet.
PRODUCT HIGHLIGHTS
1. Contactless angular measurement.
2. Measures magnetic field direction rather than field intensity.
3. Minimum sensitivity to air gap variations.
4. Large working distance.
5. Excellent accuracy, even for weak saturation fields.
6. Minimal thermal and lifetime drift.
7. Negligible hysteresis.
The ADA4571-2 is available in a 16-lead SOIC package.
8. Single-chip solution.
Rev. 0
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