'Muxing' around with delta-sigma converters

摘要

A multiplexer in your circuit can scan through a number of input channels by sampling each channel in rotation. As a power and cost advantage, multiplexed systems have only one ADC that acquires the data from all of the channels. Before starting your design, first look at the types of signals you are trying to digitize. For instance, if you know the highest and lowest frequency as well as the accuracy requirements in all of your system's channels, you may see a need for several ADCs.rnIn another scenario, the channels may have a unique time relationship to each other, requiring a simultaneously sampling approach that preserves phase information. You achieve this goal with sample-and-hdld circuits and a single ADC, or it may be easier to use individual ADCs.