Document
AA/AB-Series Analog Magnetic Sensors
AA/AB-Series Analog Magnetic Sensors
Equivalent Circuit
V+ (Supply)
OUT-
OUT+
V- (GND)
Idealized Transfer Functions Output
Output
Features • Magnetometer and gradiometer configurations • Field ranges from <<0.1 mT to >400 mT • Ultrasensitive, high-field, and low-hysteresis versions • Wheatstone bridge analog outputs • Operation to near-zero voltage • Up to 1 MHz bandwidth • Up to 150°C operating temperature • ULLGA4, TDFN6, MSOP8, and SOIC8 packages
Applications • Motion, speed, and position control • Low-field sensing • Motor commutator sensors • Noncontact current sensing
Field
AA-Series Magnetometer Transfer Function
Field Gradient
AB-Series Gradiometer Transfer Function
Description NVE’s analog GMR sensors have high sensitivity, excellent temperature stability, and small size. Their versatility and wide sensing range makes them an excellent choice for a variety of analog sensing applications including industrial and automotive position, speed, and current sensors.
The sensors are configured as inherently temperaturecompensating Wheatstone bridges.
AA-Series sensors are magnetometers, which detect absolute magnetic field. AB-Series sensors are differential gradiometers, which detect field gradients.
Three magnetometer subtypes are available: the standard AA-Series; the ultrasensitive “H” subtype; the high-field, kilooersted range “K” subtype, and the low-hysteresis “L” subtype.
Packages are as small as an ultraminiature 1.1 x 1.1 mm ULLGA4.
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NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 sensor-apps@ nve.com www.nve.com ©NVE Corporation
AA/AB-Series Analog Magnetic Sensors
Absolute Maximum Ratings
Parameter
AAxxx/ABxxx/AAL002
Supply voltage
AAHxxx/AAKxxx/ABHxxx/
AAL004/AAL024
Operating temperature
AAxxx/AAKxxx/ABxxx/AALxxx AAHxxx/ABHxxx
Storage temperature
AAxxx/AAKxx/ABxxx/AALxxx AAHxxx/ABHxxx
ESD (Human Body Model)
Applied magnetic field
Voltage from sensor connections to center pad
(applies to TDFN package only)
Symbol VCC
H
Min.
−50 −65 −65
Max. 24
12
125 150 135 150 400 Unlimited
63
Units
Volts
°C °C °C Volts Tesla Volts DC
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NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 sensor-apps@ nve.com www.nve.com ©NVE Corporation
AA/AB-Series Analog Magnetic Sensors
Operating Specifications
Parameter Supply voltage
AAHxxx/AAKxxx/ ABHxxx/AAL004
AAxxx/ABxxx/AAL002
Operating temperature
AAKxxx AAxxx/ABxxx/AALxxx AAHxxx/ABHxxx
Electrical
AAxxx/AAKxxx/AALxxx/ABxxx
offset
AAHxxx/ABHxxx
Output at maximum field
AAxxx/ABxxx AAHxxx/ABHxxx AAKxxx AALxxx
Nonlinearity
AAxxx/AAKxxx/ABxxx/AAL002 AAHxxx/ABHxxx/AAL0x4
AAHxxx/ABHxxx
Hysteresis
AAxxx/AAKxxx/ABxxx
AALxxx
Resistance tolerance
Resistance vs. temperature
AAxxx/ABxxx AAHxxx/AAKxxx/ AALxxx/ABHxxx
AAxxx/ABxxx
AAHxxx/ABHxxx
AAKxxx
Output
AALxxx
temperature AAxxx/ABxxx
coefficient
AAHxxx/ABHxxx
AAKxxx
AALxxx
AAKxxx
AAKxxx
Frequency
AAxxx/AAHxxx
bandwidth
AALxxx
ABxxx/ABHxxx
Junction– Ambient thermal resistance
ULLGA4 (-14 suffix) TDFN6 (-10 suffix) MSOP8 (-00 suffix) SOIC8 (-02 suffix)
ULLGA4 (-14 suffix)
Power Dissipation
TDFN6 (-10 suffix) MSOP8 (-00 suffix)
SOIC8 (-02 suffix)
Symbol VCC TMIN; TMAX VO
VOUT-MAX
TCR TCO-I TCO-V TCHSAT fMAX
θ JA
PD
Min. <1 −40 −50 −4 −5 19
−20
DC
Typ.
60 40 25 45 4 15
+0.14 +0.11 +0.03 -0.28 +0.13 −0.28 −0.1 -0.40 −0.3 −0.4 −0.19
500 320 320 240 100 500 500 675
Max. 12 24 85 125 150 +4 +5
2
4 2 +20
50 75 500 1
Units Volts
Test Condition
Maximum limited by power
dissipation
°C
mV/V
mV/V
%
Unipolar field
%
sweep
% %/°C
25°C No applied field
%/°C
Constant-current supply
%/°C
Constant-voltage supply
%/°C kHz kHz kHz MHz
−3 dB bandwidth
°C/W mW
Soldered to double-sided board; free air
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NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 sensor-apps@ nve.com www.nve.com ©NVE Corporation
AA/AB-Series Analog Magnetic Sensors
Operation
Sensor Subtypes There are four AA/AB-Series subtypes, as summarized in the table below. “H” subtypes are designed for very high sensitivity, and “K” types have low sensitivity and high saturation for high-field sensing. “L” types offer low hysteresis. AAH-Series parts also have a 150°C maximum temperature specification.
Parameter
Field Sensitivity Operating Field Range Hysteresis Max. Temperature
AAxxx/ ABxxx High High Medium High
AAHxxx/ ABHxxx Very High
Low High Very High
AAKxxx Low
Very High Medium Commercial
AALxxx High
Medium Low High
Magnetometer Operation AA-Series sensors are magnetometers, which detect the absolute magnetic field.
Direction of Sensitivity Unlike Hall effect or other sensors, the direction of sensitivity of GMR sensors is in the plane of the package, which more convenient for many applications. Two permanent magnet orientations.