Hello Kai,

You mentioned,
"The way you did is sometimes the only way to do, when more than one ADC/DAC-chip is used on the same board. Then a connection of analog ground and digital ground at every chip isn't possible of course. "

I had a similar problem, but was suggested to use local Analog ground planes for each ADC. And then connect those Analog ground planes to the Digital Ground plane below each ADC.

Do you think this would be a good approach ?

regards
Ashish Pradhan