The FMC150 is AC coupled and it seems that frequencies below 50 kHz are all attenuated. We thus think to switch to a FMC151 because we need the DC. We based our work on the Xiling example provided (DUC filters) with the FMC150 in a kit. I would like to make sure that our VHDL code will be compatible with the FMC151. Other question is related to FMC 150/151 latency time. From the Xilink previous example, we suppress the filter (there are still of VHDL code to reformat the data, autocalibration...) and "connected " the ADCout to the DACin of the card in order to duplicate a signal and evaluate the latency time. We found is around 400 to 450 ns. Since our application is for fast control loop, I was wondering whether you have a DC coupled product with a shorter latency time.