The AD9106 TxDAC® and waveform generator is a high performance, quad digital-to-analog converter (DAC) integrating on-chip pattern memory for complex waveform...
AD9106 on Analog.com
recommendations for CLK sources and typ values for input CLK
In general, I would recommend DAC rate > 4 * output Freq. Also bunch of factors impact clock rate selection,
c. Filter design