Hello,
thanks for the answers. Now the consideration continues, whether the ADP3250 is something for me. I don't have a specific task for it yet.
I have now connected an AD3 instead of a USB 2 hub directly to the computer with a USB-C adapter. Now I sometimes even reach 12.5 MSamples/s for one channel or almost 6 MSamples/s for two channels. But sometimes there are errors at 5 MSamples/s for two channels.
Best regards
egonotto