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Determining minimum acquisition times for SAR ADCs when a step function is applied to the input

Posted: 23 Apr 2010 ?? ?Print Version ?Bookmark and Share

Keywords:SAR ADC? data acquisition? calculating acquisition times?

This application report analyzes a simple method for calculating minimum acquisition times for successive-approximation register analog-to-digital converters (SAR ADCs). The input structure of the ADC is examined along with the driving circuit. The voltage on the sampling capacitor is then determined for the case when a step function is applied to the input of the driving circuit. Three different test cases are subsequently evaluated using both precise and approximated equations.

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