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: t excellent sensitivity to applied magnetic fields t wheatstone bridge analog output t temperature tolerance to 125c continuous t wide linear range of operation t near - zero voltage operation t dc to >1mhz frequency response t small, low profile surface mount packages applications: t general differential field sensing t gear tooth and encoder speed and position sensing t 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 se nsitivity 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 e 1 ) linear range (|oe 1 |) resistor sensitivity (%r / oe 1 ) resistance (ohms) package 2 die size 3 ( m m) 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 x y gmr pin 5, out b functional block diagram pin 1, out a pin 4, v- (ground) pin 8, v+(supply) y y x 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 characterist ics: property min typical max unit input voltage range <1 4 12.5 4 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 % / c 6 tcoi +0.03 % / c 6 tcov - 0.1 % / c 6 off axis characteristic cos b 7 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 +3 0 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. tc ov is the output change with temperature using a constant voltage source to power the sensor. 7. beta ( b ) 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 0 200 400 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: t extremely high sensitivity to applied magnetic fields t wheatstone bridge analog output t temperature tolerance to 150c continuous t wide linear rang e of operation t near - zero voltage operation t dc to >1mhz frequency response t small, low profile surface mount packages applications: t general differential field sensing t gear tooth and encoder speed and position sensing t low voltage, high temperature applicatio ns 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 w ires. magnetic characteristics: part number saturation field (oe 1 ) linear range (|oe 1 |) resistor sensitivity (%r / oe 1 ) resistance (ohms) package 2 die size 3 ( m m) min max min max abh001 - 02 70 5 40 0.06 0.12 1.2k+/ - 20% soic8 651x1231 abh001 - 00 7 0 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 x y gmr pin 5, out b functional block diagram pin 1, out a pin 4, v- (ground) pin 8, v+(supply) y y x 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 <1 4 12.5 4 volts operating frequency dc > 1 mhz operating temperature range - 50 150 c bridge electrical offset - 4 +4 mv/v si gnal output at max. field 80 mv/v nonlinearity 4 % (unipolar) 5 hysteresis 15 % (unipolar) 5 tcr +0.30 % / c 6 tcoi - 0.28 % / c 6 tcov - 0.40 % / c 6 off axis characteristic cos b 7 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 t emperature, 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 ( b ) 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 0 200 400 magnetic field applied to resistors differential voltage out of sensor (mv) increasing field on x resistors increasing field on y resistors
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