08-16-2017, 09:19 PM
Multichannel Data Acquisition Systems
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Precision Analog Applications Seminar
Multiplexing allows one ADC to do the work of several in a multichannel system. Rather than dedicating an ADC to each channel, a single converter can read every channel in sequence. This can save power, since ADCs can use a significant amount of power while switches use very little, and it can save cost, since switches are much cheaper than ADCs.
A multiplexed system using a delta-sigma converter typically has the form shown. The major change is that the anti-aliasing filter has been placed between the multiplexer and the ADC, and there are no longer anti-aliasing filters on each input channel.