| ??? 01/18/06 13:44 Read: times |
#107701 - Also datasheet of ADUC can help you Responding to: ???'s previous message |
Suresh said:
2)the signal and ground traces are routed on the top side.
3)the bottom layer could be made a solid ground plane with the GND pins of the components connected to it. You don't need to route the ground traces on top side, if you already have a ground plane on bottom side. Or did you mean the ground fill on top side, working as a shield for the various signal traces? Use as much ground fill on top side as possible and connect it by the help of vias to the ground plane on bottom side. Suresh said:
These two planes should be connected at a point known as star point using a ferrite bead or an RLC circuit. They must be connected at a point known as star point, yes, but not using a filter, but directly to each other. Suresh, there are many evaluation boards available, dealing with this analog digital stuff. The according schematics can often be seen in their manuals or application notes of manufacturers of microcontrollers. If I remember correctly even in the datasheet of ADUC series proper schematics can be seen, which demonstrate how to manage the analog and digital grounds and much more. Have a look at this. Kai |
