AD9174 Direct Clock

Hello. I have a question about the AD9174.

My customer focused on AD9174.
The performance shown in Figure 38 seems to be especially appreciated by my customers.
Figure 38. SSB Phase Noise vs. Frequency Offset over fOUT, fDAC = 12 GHz, Direct Clock (PLL Off)
Data Sheet AD9174 Rev. B | Page 25 of 165

Can you show us a setting that brings out this performance?
I am happy that the clock source is your PLL product.

Best regards