SBOS932C January 2020 – March 2021 THP210
In most ADC applications, an FDA is required to drive capacitive load of an RC charge kickback filter. Other applications may require some other next-stage devices to be driven. The strong output stage of the THP210 drives higher capacitive loads compared to other FDAs. Figure 6-25 implies that the small-signal overshoot is less then 20% at a direct capacitive load connection of 140 pF. To help avoid instability and drive higher capacitive loads, add a small resistor (referred to as isolation resistor RISO in both this plot and Figure 6-26) at the outputs of the THP210 before the capacitive load.