Abstract

The analog-to-digital converter (ADC) is a key module used to sense feedback and monitoring signals in a real-time control application. However, without careful design and evaluation of the circuits driving the ADC input, significant sample-and-hold circuit (S+H) settling errors can occur, resulting in poor performance of the ADC sensing and thus the system. This application report will identify the resources that can be used to understand ADC input settling and design appropriate ADC driving circuits as well as how to evaluate these resources in the specific context of TMS320F2837xD, TMS320F2837xS, TMS320F2838xD, TMS320F2838xS, TMS320F2807x, TMS320F28004x, TMS320F28002x, TMS320F28003x, TMS320F280013x, and the TMS320F280015x series microcontrollers.

Project collateral and source code discussed in this application report can be downloaded from the following URL: http://www.ti.com/lit/zip/spracy9. This application report uses the PSpice for TI design and simulation tool. ADC Input Circuit Evaluation for C2000 MCUs (TINA-TI) covers the same content but uses the TINA-TI SPICE-based analog simulation program instead.