Analog Devices 5B34-03 Isolated Linearized RTD Input

Analog Devices 5B34-03 Isolated Linearized RTD Input is a compact signal-conditioning module that provides a galvanically isolated, linearized interface for RTD sensors, supporting 2- or 3-wire configurations. It delivers continuous isolation between the RTD input and the host system up to 1500 V rms, protecting downstream electronics and reducing ground-loop errors, while supplying RTD excitation and lead-resistance compensation as part of its input conditioning. The front end is chopper-stabilized for low drift, with typical drift around ±1 µV/°C and robust protection rated to 240 V rms on the input, enabling safe operation in industrial environments. RTD linearization is integrated, yielding a high-level analog voltage output suitable for standard data-acquisition or control-system ADCs, and the device is specified with calibrated accuracy of about +0.05%. The 5B34 family is designed for direct installation in isolated I/O subsystems, delivering a single-channel RTD input with full isolation and built-in signal conditioning rather than requiring extensive external circuitry. This variant, the 5B34-03, is commonly used in industrial temperature sensing and process control, enabling accurate, isolated RTD measurements in automation, HVAC, and instrumentation applications where signal integrity and safety isolation are critical.