Analog Devices Inc. ADA4571 集成式 AMR 磁性角度传感器
亚德诺半导体 ADA4571 是一款各向异性磁阻(AMR)传感器，集成了信号调理放大器和 ADC 驱动器。 ADA4571 产生两路模拟输出，指示周围磁场的角位置。ADA4571 在一个封装内集成两个芯片，即一个 AMR 传感器和一个固定增益（标称值 G = 40）仪表放大器。ADA4571 可提供有关旋转磁场角度的干净且经过放大的余弦和正弦输出信号。输出电压范围与电源电压成比例。传感器含有两个互成 45°角的惠斯登电桥。x-y 传感器平面的旋转磁场提供两路正弦输出信号，且传感器与磁场方向的角度(α)频率翻倍。在 x-y 平面的均匀场内，输出信号与 z 轴（气隙）的物理位置无关。 ADA4571集成式 AMR 磁性角度传感器和 & 信号调理器采用 8 引脚 SOIC 封装，适用于绝对位置测量（线性和角度）、无刷直流电机控制与定位、执行器控制与定位、非接触式角度测量与检测、磁性角位置检测。
The ADA4571 includes two die within one package, an AMR sensor, and a fixed gain (G = 40 nominally) instrumentation amplifier. The ADA4571 provides 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).
特性
- 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
- Minimal thermal and lifetime drift
- Negligible hysteresis
- Single chip solution
- High precision 180° angle
- Maximum angular error of 0.5°
- Analog sine and cosine outputs
- Ratiometric output voltages
- Low thermal and lifetime drift
- SAR or Σ-Δ analog-to-digital converter (ADC) drive capable
- Magnetoresistive (MR) bridge temperature compensation mode
- Temperature range: −40°C to +150°C
- EMI resistant
- Fault diagnostics
- VDD from 2.7V to 5.5V
- Minimum phase delay
- Qualified for automotive applications
- Available in an 8-lead SOIC package
应用
- Absolute position measurement (linear and angle)
- Brushless dc motor control and positioning
- Actuator control and positioning
- Contactless angular measurement and detection
- Magnetic angular position sensing
Functional Block Diagram
发布日期: 2015-04-14
| 更新日期: 2023-08-21