I use AD9959 evaluation board to design a sine-wave signal generator. As I have installed the evaluation software and followed the steps supplied by the evaluation board datasheet. Everything is OK, but when I load the AD9959 Eval software, a error occures "The evaluation board doesn't seem to have a Refclk! Please check your connections!''. Then when I click the "OK" button,the status message dissapears and USB Status"Ezssp-0", DUT Type"AD9959".
I don't know how to resolve the problem. Thank you!