Post Go back to editing

AD9912:Signal drift, the output signal is not stable

Hi! I have some probelem when using AD9912. I have an input sysclk of 1GHz(system pll bypassed), and i set the FTW register to a fixed number, but i got a signal whose fequency is not fixed. In theory, the output shouldn't be drifting, are there some issues i failed to notice? Thanks for help!