Variable Reluctance Sensor Interface

Variable reluctance (VR) sensors are preferred for industrial and automotive environments because they withstand mechanical vibration and high temperature operation up to 300°C. In most applications, they sense a steel target that is part of a rotating assembly. Because the unprocessed signal amplitude is proportional to target speed, a sensor whose signal-processing circuitry is designed for high speed will cease to function as rotation slows. VR sensors like the MAX9924/MAX9927 have a coil to sense the speed and rotation of motors. Integrated VR-sensor interface solutions possess many advantages over other solutions, including enhanced noise immunity and accurate phase information.