The CS5373A is a high-performance, fourth-order modulator integrated with a digital-to-analog converter (DAC). When combined with a CS3301A / CS3302A differential amplifier and the CS5378 digital filter, a small, low-power, self-testing, high-accuracy, singlechannel measurement system results. The modulator has high dynamic range and low total harmonic distortion with very low power consumption. It converts differential analog input signals from the CS3301A / CS3302A amplifier to an oversampled serial bit stream at 512 kbits per second. This oversampled bit stream is then decimated by the CS5378 digital filter to a 24-bit output at the selected output word rate. The test DAC operates in either AC or DC test modes. AC test modes measure system dynamic performance through THD and CMRR tests while DC test modes are for gain calibration and pulse tests. It has two sets of differential analog outputs, OUT and BUF, as dedicated outputs for testing the electronics channel and for incircuit sensor tests. Output attenuation settings are binary weighted and match the gain settings of the CS3301A / CS3302A differential amplifiers for full-scale testing at all gain ranges.