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PDF ADA4571 Data sheet ( Hoja de datos )
| Número de pieza | ADA4571 | |
| Descripción | Integrated AMR Angle Sensor and Signal Conditioner | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Integrated AMR Angle Sensor and
Signal Conditioner
ADA4571
FEATURES
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
APPLICATIONS
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
FUNCTIONAL BLOCK DIAGRAM
VDD
ADA4571
TEMPERATURE SENSOR
VTEMP
BRIDGE DRIVER
GC
EMI
FILTER
+
G = 40
–
DRIVER
VSIN
AMR BRIDGE
SENSORS
BIAS OSCILLATOR FAULT DETECTION
EMI
FILTER
+
G = 40
–
DRIVER
VCOS
GND
GND
Figure 1.
PD
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).
The ADA4571 is available in an 8-lead SOIC package.
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
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.
Rev. 0
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
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
Single Point Calibration Angular
Error2, 3
Dynamic Angular Error4
Angular Inaccuracy3, 5
OUTPUT PARAMETERS
Amplitude
GC = GND
GC = VDD
Output Voltage Range
Output Voltage Low
Output Referred Offset Voltage
Amplitude Synchronism Error6
Delay Time
Phase Error7
Orthogonality Error3
Output Noise
Output Series Resistance
Output −3 dB Cutoff Frequency3
Power Supply Rejection3
Output Short-Circuit Current
Sensitivity
POWER SUPPLY
Supply Voltage
Quiescent Supply Current
Power-Up Time
Symbol Test Conditions/Comments
Min
αUNCORR
αCAL
TA = −40°C
TA = 25°C
TA = 125°C
TA = −40°C to +125°C, GC = GND
0
αDYNAMIC
∆α
TA = −40°C to +125°C, GC = VDD
TA = −40°C to +125°C, rotation frequency =
2000 rpm
After end of line (EOL) calibration for offset
voltage error and amplitude synchronism at
TA = −40°C to +125°C (only 180° range)
VAMP
VO_SWING
VOL
VOFFSET
k
tDEL
ΦERR
OE
VNOISE
RO
f−3dB
PSRR
ISC
SEN
TA = −40°C
TA = 25°C
TA = 125°C
TA = −40°C
TA = 25°C
TA = 125°C
VSIN and VCOS, normal operation
VSIN or VCOS, broken bond wire detected
GC = VDD
GC = GND
Rotation frequency = 30,000 rpm
Rotation frequency = 30,000 rpm
BW = 80 kHz, RTO
Normal operation, PD = GND
PD = VDD
Amplifier BW, CL = 10 pF
Measured as output variation from VDD/2,
VDD = 2.7 V to 5.5 V, RL = 200 kΩ to GND,
GC = GND or VDD
Short to GND per pin (VSIN, VCOS)
Short to VDD per pin (VSIN, VCOS)
α = 0° and 135°, TA = 25°C
63
41
21
56
52
38
7
−0.75
63
15
−15
VDD
ISY
tPWRUP
PD = GND, GC = GND, no load
PD = GND, GC = VDD
PD = VDD, no load
To 98% of desired output level after VDD was
reached
To 98% of desired output level after PD cycling
2.7
3.5
Typ
±0.5
±0.5
0.1
0.05
2
0.8
500
50
100
80
20
−18
52
4.5
Max Unit
180 Degrees
±3 Degrees
±3 Degrees
±4 Degrees
Degrees
Degrees
±0.4 Degrees
Degrees
75
53
33
77
72
57
93
3.75
3.75
3.75
+0.75
0.05
% VDD
% VDD
% VDD
% VDD
% VDD
% VDD
% VDD
% VDD
% VDD
% VDD
% peak
µs
Degrees
Degrees
µV rms
Ω
kΩ
kHz
dB
mA
mA
mV/°
5.5 V
6 mA
6.5 mA
12.5 µA
150 µs
100 µs
Rev. 0 | Page 5 of 21
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1.2
1.0
0.8
0.6
0.4
0.2
0
–40 0
40 80 120
TEMPERATURE (°C)
Figure 15. Single Point Calibration Angular Error, VDD = 2.7 V, GC = On
1.2
1.0
0.8
0.6
0.4
0.2
0
–40 0
40 80 120
TEMPERATURE (°C)
Figure 16. Single Point Calibration Angular Error, VDD = 2.7 V, GC = Off
7
6
5
4
3
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VDD (V)
Figure 17. Supply Current (ISY) vs. Voltage (VDD), T = 25°C
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ADA4571
5.8
GC OFF (mA)
GC ON (mA)
5.6
5.4
5.2
5.0
4.8
4.6
–40
0
40 80 120
TEMPERATURE (°C)
Figure 18. Supply Current (ISY) vs. Temperature, VDD = 5 V
4.6
GC OFF (mA)
GC ON (mA)
4.4
4.2
4.0
3.8
3.6
–40
0
40 80 120
TEMPERATURE (°C)
Figure 19. Supply Current (ISY) vs. Temperature, VDD = 3 V
10
5V
3V
8
6
4
2
0
–40 0
40 80 120
TEMPERATURE (°C)
Figure 20. Power-Down Current (IPD) vs. Temperature
Rev. 0 | Page 11 of 21
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