I know that the AD9910 DDS fed with a 1GHz reference runs on a 250MHz clock called SYNC_CLK and all internal changes like IOUPDATE occur on the rising edge of this SYNC_CLK. I wonder whether there is a similar internal sync clk for the AD9912. Such a SYNC_CLK is not mentioned in the datasheet also the chip does not have any synchronization pins. Is it running internally and not provided externally? Or does the chip not have such a SYNC_CLK signal and updates exactly at the edge of IOUPDATE?
I will be thankful to your reply