There is a typo error at DAC Modulator Filter components at ADL5373, ADL5374(Fig32,34), and ADL5375(Fig 60, 63).
C1I and CIQ should be at pF not nF. So they are 53.62pF and filter performance is as shown at datasheet(Fig33 at ADL5373/4, Fig61at ADL5375).
This typo also appears in Figure 4 of CN-0205 "Interfacing the ADL5375 Modulator to the AD9122 Dual Channel, 1.2 GSPS High Speed DAC."
There is a corrected one in the Figure 4 of CN-0205(I checked it at the web). Please check it again. If there are 53.62pF, it is right one.