Hey all, I have a system working as expected and now I reached the prototyping phase. The thing is, I developed the system on a development board with everything embedded on it but I am not using all the peripherals. At the prototyped PCB there will only be 1 adc, 1 dac , clock and the FPGA itself. It's the Xilinix Spartan 3E board. Thus I am looking for options to choose a very stable clock source (200MHz would be great but I can live with the 100MHz as well). I am sure some of you experienced this scheme before and can provide some insight. Cheers. Y. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .