Thanks for high-lighting this - we will take in account for future enhancements. As written above, it is assumed for Sigma-Delta-ADCs to work this way, any change to the configuration restarts the ADC and the settling time of the filter is required to get valid data. For further clarification, please have a look at http://designtools.analog.com/dt/sdtutorial/sdtutorial.html and further documents like http://www.analog.com/static/imported-files/application_notes/28715432842357460935458165408691AN388.pdf ...
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