this is an off the wall thing I need to do, so I have questions. I have uploaded the schematic that I think would work for one of the 4 sections. What capacitors should I select for the crystals? Also since there are going to be four of these on the same board along with two 4 port USB hub circuits on the same board, (Which I still need to design) that will be a total of 10 crystals, can I use the same crystal for all four of the atmega and use the same one for all four of the ch340g chips? Obviously one will be 16mhz and 12 mhz. Also, if anyone has any recommendations for the USB Hub portion of my board, please chime in and let me know, as this is WAY out of my comfort zone of hardware. I do hardware professionally, but never did something like this before.
If I do have to use all 10, do I need to completely isolate and RF shield the individual circuits? Let me add in right now that I will be designing an actual PCB for this. Also is it okay to go with through-hole Quartz crystals so they are easier to solder? Or do I HAVE to use the ceramic resonators? Not to worried about making this as compact as possible considering most of the components are already compact and this is all going on a large 68 pin card edge connector type board. Thanks for any help that I can get with this.