Direct-Sampling DACs in Theory and Application

By: Stephanie Overhoff

Abstract: High-speed digital-to-analog converters (DACs) with high resolution in the 12- to 14-bit range enable new types of transmitter designs that employ a direct modulation scheme. In such designs, the modulated transmission signal is generated directly on the base frequency. This application note explains how direct-sampling RF DACs enable new communications systems such as cable infrastructure and explains how to synchronize multiple DACs that have multiplexed inputs (MUXDACs).