AB Sensors
RHOPOINT COMPONENTS
Tel: +44 (0) 870 608 1188 Fax: +44 (0) 870 241 2255
Web: www.rhopointcomponents.com Email: sales@rhopointcomponents.com
AB Sensors
Features:
⇒ Excellent Sensitivity to Applied Magnetic Fields
⇒ Wheatstone Bridge Analog Output
⇒ Temperature Tolerance to 125°C Continuous
⇒ Wide Linear Range of Operation
⇒ Near-Zero Voltage Operation
⇒ DC to >1MHz Frequency Response
⇒ Small, Low Profile Surface Mount Packages
Applications:
⇒ General Differential Field Sensing
⇒ Gear Tooth and Encoder Speed and Position Sensing
⇒ Low Power, Low Voltage Applications
Description:
The AB series GMR sensors are general purpose gradiometers for use in a wide variety
of applications. Two pairs of unshielded GMR sensor elements provide for directional
sensing of small gradients in large and small magnetic fields. The ability to detect only
magnetic gradients allows low sensitivity to external sources of uniform magnetic field,
allowing these sensors to work successfully in high magnetic noise environments, such as
near electric motors or current carrying wires.
Magnetic Characteristics:
Part
Number Saturation
Field (O e1) Linear
Range
(|Oe1|)
Resistor
Sensitivity
(%R / Oe1)
Resistance
(Ohms) Package2 Die Size3
(µm)
Min Max Min Max
AB001-02 250 20 200 0.02 0.03 2.5K+/-20% SOIC8 651x1231
AB001-00 250 20 200 0.02 0.03 2.5K+/-20% MSOP8 651x1231
V- (ground)
OUT B
Orientation
chamfer
OUT A
V+ (supply)
Pin-out
NVE
ABxxx
-02
Axis of Sensitivity
XY
GMR
pin 5, OUT B
Functional Block diagram
pin 1, OUT A
pin 4, V-
(ground)
pin 8, V+(supply)
Y
YX
X
AB Sensors
RHOPOINT COMPONENTS
Tel: +44 (0) 870 608 1188 Fax: +44 (0) 870 241 2255
Web: www.rhopointcomponents.com Email: sales@rhopointcomponents.com
General Characteristics:
Property Min Typical Max Unit
Input Voltage Range <14 ±12.54 Volts
Operating Frequency DC > 1 MHz
Operating Temperature Range -50 125 °C
Bridge Electrical Offset -4 +4 mV/V
Signal Output at Max. Field 120 mV/V
Nonlinearity 2 % (unipolar)5
Hysteresis 4 % (unipolar)5
TCR +0.14 % / °C6
TCOI +0.03 % / °C6
TCOV -0.1 % / °C6
Off Axis Characteristic Cos β7
ESD Tolerance 400 V pin to pin HBM
Notes:
1. 1 Oersted (Oe) = 1 Gauss in air.
2. See the Appendix for package dimensions and tolerances.
3. Sensors can be provided in die form by special request.
4. GMR AB Series sensors are pure ratiometric devices, meaning that they will operate properly at extremely
low supply voltages. The output signal will be proportional to the supply voltage. Maximum voltage
range is limited by the power dissipation in the package and the maximum operating temperature of the
sensor.
5. Unipolar operation means exposure to magnetic fields of one polarity, e.g. 0 to 30 Gauss, or –2 to –50
Gauss, but not –20 to +30 Gauss (bipolar operation). Bipolar operation will increase nonlinearity and
hysteresis.
6. TCR is resistance change with temperature with no applied field. TCOI is the output change with
temperature using a constant current source to power the sensor. TCOV is the output change with
temperature using a constant voltage source to power the sensor.
7. Beta (β) is any angle from the sensitive axis.
The Figure to the left is
a simulated output from
an NVE Gradiometer.
The output / gradient
correlation shown
assumes one pair of
resistors is held at zero
field. Note the bipolar
output.
Typical Gradiometer Transfer Function
-50
-40
-30
-20
-10
0
10
20
30
40
50
-400 -200 0200 400
Magnetic Field Applied to Resistors
Differential Voltage Out of Sensor (mV)
Increasing field
on X resistors
Increasing field
on Y resistors
ABH Sensors
RHOPOINT COMPONENTS
Tel: +44 (0) 870 608 1188 Fax: +44 (0) 870 241 2255
Web: www.rhopointcomponents.com Email: sales@rhopointcomponents.com
ABH Sensors
Features:
⇒ Extremely High Sensitivity to Applied Magnetic Fields
⇒ Wheatstone Bridge Analog Output
⇒ Temperature Tolerance to 150°C Continuous
⇒ Wide Linear Range of Operation
⇒ Near-Zero Voltage Operation
⇒ DC to >1MHz Frequency Response
⇒ Small, Low Profile Surface Mount Packages
Applications:
⇒ General Differential Field Sensing
⇒ Gear Tooth and Encoder Speed and Position Sensing
⇒ Low Voltage, High Temperature Applications
Description:
The ABH series GMR sensors are low field, high temperature gradiometers for use in a
wide variety of applications. Two pairs of unshielded GMR sensor elements provide for
directional sensing of small gradients in large and small magnetic fields. The ability to
detect only magnetic gradients allows low sensitivity to external sources of uniform
magnetic field, allowing these sensors to work successfully in high magnetic noise
environments, such as near electric motors or current carrying wires.
Magnetic Characteristics:
Part
Number Saturation
Field (Oe1) Linear
Range
(|Oe1|)
Resistor
Sensitivity
(%R / Oe1)
Resistance
(Ohms) Package2 Die Size3
(µm)
Min Max Min Max
ABH001-02 70 5 40 0.06 0.12 1.2K+/-20% SOIC8 651x1231
ABH001-00 70 5 40 0.06 0.12 1.2K+/-20% MSOP8 651x1231
V- (ground)
OUT B
Orientation
chamfer
OUT A
V+ (supply)
Pin-out
NVE
ABxxx
-02
Axis of Sensitivity
XY
GMR
pin 5, OUT B
Functional Block diagram
pin 1, OUT A
pin 4, V-
(ground)
pin 8, V+(supply)
Y
YX
X
ABH Sensors
RHOPOINT COMPONENTS
Tel: +44 (0) 870 608 1188 Fax: +44 (0) 870 241 2255
Web: www.rhopointcomponents.com Email: sales@rhopointcomponents.com
General Characteristics:
Property Min Typical Max Unit
Input Voltage Range <14 ± 12.54 Volts
Operating Frequency DC > 1 MHz
Operating Temperature Range -50 150 °C
Bridge Electrical Offset -4 +4 mV/V
Signal Output at Max. Field 80 mV/V
Nonlinearity 4 % (unipolar)5
Hysteresis 15 % (unipolar)5
TCR +0.30 % / °C6
TCOI -0.28 % / °C6
TCOV -0.40 % / °C6
Off Axis Characteristic Cos β7
ESD Tolerance 400 V pin to pin HBM
Notes:
1. 1 Oersted (Oe) = 1 Gauss in air.
2. See the Appendix for package dimensions and tolerances.
3. Sensors can be provided in die form by special request.
4. GMR AB Series sensors are pure ratiometric devices, meaning that they will operate properly at extremely
low supply volt ages. The output signal will be proportional to the supply voltage. Maximum voltage
range is limited by the power dissipation in the package and the maximum operating temperature of the
sensor.
5. Unipolar operation means exposure to magnetic fields of one polarity, e.g. 0 to 30 Gauss, or –2 to –50
Gauss, but not –20 to +30 Gauss (bipolar operation). Bipolar operation will increase nonlinearity and
hysteresis.
6. TCR is resistance change with temperature with no applied field. TCOI is the output change with
temperature, using a constant current source to run the sensor. TCOV is the output change with
temperature, using a constant voltage source to run the sensor.
7. Beta (β) is any angle from the sensitive axis.
The Figure to the left is
a simulated output from
an NVE Gradiometer.
The output / gradient
correlation shown
assumes one pair of
resistors is held at zero
field. Note the bipolar
output.
Typical Gradiometer Transfer Function
-50
-40
-30
-20
-10
0
10
20
30
40
50
-400 -200 0200 400
Magnetic Field Applied to Resistors
Differential Voltage Out of Sensor (mV)
Increasing field
on X resistors
Increasing field
on Y resistors
