Hello Ron, I recommend to first try to inject the J9 CLKIN clock source from an external test equipment to see if the connection to the J9 and also the J9 connector is properly soldered down to the EVM. There may be cases where the SMA connector center pin may not be making proper contact due to mechanical stress. Try to increase the J9 CLKIN power higher as described in the EVM user's guide to see if you can improve the situation. Perhaps you may touch up the soldering with soldering iron. If necessary, please contact your EVM supplier for an EVM replacement. You may also run the default setup script within the DAC3484 EVM GUI, which are known good test setup to eliminate variables of the clock chip configuration. The default scripts have setup for 1228.8MSPS of DAC and also 983.04MSPS of DAC with the CDCE62005 in clock distribution mode. If you want to set the CDCE62005 in PLL mode, we also have some configurations as well. For more advanced configuration of the CDCE62005 outside of the scope of the default EVM setup, we may have to refer you to the clocking forum for more assistance. They have more expertise in helping the advanced setup. -Kang
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