AMR Angle Sensor and Signal Conditioner Module

This angle sensor module features an ADA4571 chip, an anisotropic magneto resistive (AMR) sensor with integrated signal conditioning amplifiers and ADC drivers. The circuit produces two analog outputs that indicate the angular position of the surrounding magnetic field.

The ADA4571 consists of two die within one package, an AMR sensor, and a fixed gain (G = 40 nominally) instrumentation amplifier. The ADA4571 delivers clean and amplified cosine and sine output signals related to the angle of a rotating magnetic field. The output voltage range is Ratiometric to the supply voltage. The sensor contains two Wheatstone bridges, at a relative angle of 45° to one another. A rotating magnetic field in the x-y sensor plane delivers two sinusoidal output signals with the double frequency of the angle (α) between the sensor and magnetic field direction. Within a homogeneous field in the x-y plane, the output signals are independent of the physical placement in the z direction (air gap).

Features

• Power Supply 2.7V to 5.5V DC
• Quiescent Supply Current 7mA (Only Chip), No LED
• High precision 180° angle sensor
• Maximum angular error of 0.5°
• Analog sine and cosine outputs
• Power Up Time 150uS
• Ratiometric output voltages
• Low thermal and lifetime drift
• Temperature Voltage Range -40 to 150 Degree Centigrade (0 to 80% of VDD)
• SAR or Σ-∆ analog-to-digital converter (ADC) drive capable
• Magnetoresistive (MR) bridge temperature compensation mode
• Contactless angular measurement.
• Measures magnetic field direction rather than field intensity.
• Minimum sensitivity to air gap variations.
• Large working distance.
• Excellent accuracy, even for weak saturation fields.
• Negligible hysteresis.
• Temperature range: −40°C to +150°C
• EMI resistant
• Fault diagnostics
• Minimum phase delay
• PCB Dimensions 33.18 X 17.78MM
• 4 X 2.5MM Mounting Holes