A Most Significant Bit (MSB) cascaded digital-to-analog converter (DAC) architecture connects multiple DAC units, where each handles a different portion of the digital input word. The most significant bits are processed by the first DAC, and its output influences the reference voltage for subsequent DACs handling progressively less significant bits. This arrangement enhances resolution beyond the capabilities of a single DAC while potentially improving linearity and minimizing component mismatch errors. For example, a 16-bit DAC could be constructed using two 8-bit DACs cascaded in this MSB configuration.
Cascading DACs using the MSB approach allows designers to achieve higher resolution conversion than readily available in single integrated circuits. This can be particularly advantageous in applications demanding high precision, such as instrumentation, scientific measurement, and audio processing. Historically, this approach provided a crucial pathway to increased resolution before high-bit DACs became common. The architecture also helps manage component inaccuracies and non-linearities, contributing to improved overall performance in dynamic range and signal fidelity.
