AB Sensors 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. V+ (supply) Pin-out OUT B Functional Block diagram pin 8, V+(supply) NVE ABxxx -02 X Orientation chamfer GMR Y Y pin 5, OUT B X OUT A X V- (ground) Y pin 1, OUT A pin 4, V(ground) Axis of Sensitivity Magnetic Characteristics: Part Number Saturation Field (Oe1) AB001-02 AB001-00 250 250 Linear Range (|Oe1|) Min Max 20 200 20 200 Resistor Sensitivity (%R / Oe 1) Min Max 0.02 0.03 0.02 0.03 Resistance (Ohms) Package 2 Die Size 3 (µm) 2.5K+/-20% 2.5K+/-20% SOIC8 MSOP8 651x1231 651x1231 RHOPOINT COMPONENTS Tel: +44 (0) 870 608 1188 Fax: +44 (0) 870 241 2255 Web: www.rhopointcomponents.com Email: [email protected] AB Sensors General Characteristics: Property Input Voltage Range Operating Frequency Operating Temperature Range Bridge Electrical Offset Signal Output at Max. Field Nonlinearity Hysteresis TCR TCOI TCOV Off Axis Characteristic ESD Tolerance Min <14 DC -50 -4 Typical Max ±12.54 >1 125 +4 120 2 4 +0.14 +0.03 -0.1 Cos β 7 400 Unit Volts MHz °C mV/V mV/V % (unipolar)5 % (unipolar)5 % / °C6 % / °C6 % / °C6 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. Typical Gradiometer Transfer Function Differential Voltage Out of Sensor (mV) 50 40 30 20 Increasing field on X resistors 10 0 -400Increasing -200 field on Y resistors -10 0 200 -20 -30 -40 400 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. -50 Magnetic Field Applied to Resistors RHOPOINT COMPONENTS Tel: +44 (0) 870 608 1188 Fax: +44 (0) 870 241 2255 Web: www.rhopointcomponents.com Email: [email protected] ABH Sensors 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. V+ (supply) Pin-out OUT B Functional Block diagram pin 8, V+(supply) NVE ABxxx -02 X Orientation chamfer GMR Y Y pin 5, OUT B X OUT A X V- (ground) Y pin 1, OUT A pin 4, V(ground) Axis of Sensitivity Magnetic Characteristics: Part Number Saturation Field (Oe1) ABH001-02 ABH001-00 70 70 Linear Range (|Oe1|) Min Max 5 40 5 40 Resistor Sensitivity (%R / Oe 1) Min Max 0.06 0.12 0.06 0.12 Resistance (Ohms) Package 2 Die Size 3 (µm) 1.2K+/-20% 1.2K+/-20% SOIC8 MSOP8 651x1231 651x1231 RHOPOINT COMPONENTS Tel: +44 (0) 870 608 1188 Fax: +44 (0) 870 241 2255 Web: www.rhopointcomponents.com Email: [email protected] ABH Sensors General Characteristics: Property Input Voltage Range Operating Frequency Operating Temperature Range Bridge Electrical Offset Signal Output at Max. Field Nonlinearity Hysteresis TCR TCOI TCOV Off Axis Characteristic ESD Tolerance Min <14 DC -50 -4 Typical Max ± 12.54 >1 150 +4 80 4 15 +0.30 -0.28 -0.40 Cos β 7 400 Unit Volts MHz °C mV/V mV/V % (unipolar)5 % (unipolar)5 % / °C6 % / °C6 % / °C6 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. Typical Gradiometer Transfer Function Differential Voltage Out of Sensor (mV) 50 40 30 20 Increasing field on X resistors 10 0 -400Increasing -200 field on Y resistors -10 0 200 -20 -30 -40 -50 Magnetic Field Applied to Resistors 400 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. RHOPOINT COMPONENTS Tel: +44 (0) 870 608 1188 Fax: +44 (0) 870 241 2255 Web: www.rhopointcomponents.com Email: [email protected]