ADA4571-2 Datasheet, PDF (1/13 Pages) Analog Devices – Integrated AMR Angle Sensor and Signal Conditioner

Data Sheet
Integrated AMR Angle Sensor and
Signal Conditioner
ADA4571-2
FEATURES
High precision, 2-channel, isolated AMR angle sensor for
redundant systems
Angular range of 0° to 180°
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
Available in a 16-lead SOIC package
Qualified for automotive applications
APPLICATIONS
Permanent magnet synchronous motor (PMSM) control and
positioning
Contactless angular measurement and detection
Magnetic angular position sensing
FUNCTIONAL BLOCK DIAGRAM
GND1 GND1
VDD1
ADA4571-2
TEMPERATURE SENSOR
BRIDGE DRIVER
VTEMP1
GC1
EMI
FILTER
+
G = 40
–
DRIVER
VSIN1
AMR BRIDGE _{BIAS OSCILLATOR} FAULT DETECTION
SENSORS
EMI
FILTER
+
G = 40
–
DRIVER
TEMPERATURE SENSOR
BRIDGE DRIVER
VCOS1
PD1
VTEMP2
GC2
GENERAL DESCRIPTION
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.
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.
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.
The ADA4571-2 is available in a 16-lead SOIC package.
Rev. 0
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EMI
FILTER
+
G = 40
–
DRIVER
VSIN2
AMR BRIDGE _{BIAS OSCILLATOR} FAULT DETECTION
SENSORS
EMI
FILTER
+
G = 40
–
DRIVER
VCOS2
PD2
GND2 GND2
VDD2
Figure 1.
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.
8. Single-chip solution.
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