SPRUJ53B April 2024 – September 2024 TMS320F28P550SJ , TMS320F28P559SJ-Q1
The minimum ADC acquisition window for sampling the PGA_OF filtered signal with one ADC varies based on the values of RFILTER and CFILTER. To make sure of good performance, choose a CFILTER capacitor that is large enough to satisfy most of the ADC sample and hold capacitor (Ch) charge requirements. The CFILTER value can be sized based on the acceptable amount of ADC sampling error (LSBErr):
See Chapter 15 to determine the ADC acquisition window, where the ADC source resistance (Rs) is equal to RFILTER.