Signal Conditioning Circuit using On Board Gain Adjust Circuitry AN-003

This application note describes a precision signal-conditioning approach that uses a laser-trimmed, on-board gain programming resistor to standardize the output of low-level Wheatstone bridge pressure sensors, enabling sensor interchangeability while maintaining a consistent 0–5 V output. It details the constant-current excitation method, instrumentation amplifier configuration, gain equations, calibration procedures, and component tolerance considerations required to achieve approximately 1% system accuracy without pressure testing, with optional span calibration for tighter normalization