Designing SAR ADC Drive Circuitry: Part III Designing The Optimal Input Drive Circuit For SAR ADCs by Rick Downs, Applications Engineering Manager, and Miro Oljaca, Systems Engineer, Data Acquisition Products,
Texas Instruments
Concluding this series, this TechNote builds on the foundations established in the previous two installments. It discusses how to choose an operational amplifier (op amp) to drive a successive-approximation register (SAR) analog-to-digital converter (ADC). We'll further explore how to optimize an external RC circuit (charge reservoir) for the desired performance. Example circuits and actual test results illustrate the selected design criteria.
