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AFF755
MagnetoResistive Magnetic Field Sensor
The AFF755B is a low noise magnetic field sensor based on the anisotropic magnetoresistive (AMR) effect. The sensor contains a Wheatstone bridge including a flip coil for offset correction. This measurement principle also reduces the temperature coefficient of the offset by a factor of 100. This sensor is ideally suited for the detection of weak magnetic fields (< 10 nT) including the earth magnetic field. The voltage necessary for driving the required flip-current of 100 mA is smaller than 0.5 V. This allows the serial connection of 3 sensors for a 3-axis measurement with typical supply voltages (1.8 V) available in battery powered devices.
| Article Description | Package | Delivery Type |
|---|---|---|
| AFF755BHA-AD | SO8 | Tape On Reel |
| Symbol | Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| VCC | Supply Voltage | - | 5 | 9 | V |
| IF | Flip current | - | +/- 100 | +/- 150 | mA |
| S | Sensitivity (in range +/- 400 A/m) | 13 | 14.5 | 16 | mV/V/kA/m |
| RB | Bridge Resistance | 2.2 | 2.5 | 2.8 | kΩ |
| RF | Flip coil resistance | 1.0 | 1.5 | 2.0 | Ω |
Features
- Based on the anisotropic magnetoresistive (AMR) effect
- Contains one Wheatstone Bridge
- Integrated flip coil
- Temperature range from -40 °C to +125 °C
Advantages
- Extreme sensitivity
- Wide range of magnetic field strength
- Low power consumption
- Low flip coil resistance
- Very good signal to noise ratio
Applications
- Compass
- Navigation Systems
- Battery powered applications
- Magnetometry
- Measurement of terrestrial magnetic field
- Traffic detection
- Nondestructive testing
The product is under development, qualification has not started. Delivered Products have a sample status. The datasheet is preliminary.