Data Converters

Cross Reference

Application Notes

Training

Tools & Software

Block Diagrams

WEBENCH® Design Center

Determining Minimum Acquisition Times for SAR ADCs, part 1 (Rev. A)

 

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.