I have read that for a board with analogue and digital grounds, they must be kept separate and joined at one point only. I cannot for the life of my find out how to this in Eagle PCB design which is now at version 7.
I have a board with data converters which means that I shall have 3.3V digital and 5V analogue supply and also a Vref. This will result in 2 ground planes. They will be need to be connected at 1 point on the PCB. What is the orthodox way to ->connect<- these two planes within the Eagle PCB software? I mean it is easy to have 2 separate nets with names like DGND and AGND but how to connect them in the board layout editor? Also, will the DRC raise error that the net on the component should be GND but is DGND or AGND?
Finally, besides this question on how to connect the two ground planes, could you tell me if the top planes would also be ground or they need to be 5V and 3.3V planes which will directly connect to the data converters supply pins rather than me have floating top planes and only use tracks to the connect the 3.3V and 5V pins on the data converters?
Please help... I can't find this anywhere.