As the sample rate is only 2.5Mhz for each channel, can we follow the AD922X quite simple input type for AD9252 design?
The reference design of AD9252 uses quite complex transformer.
It is possible to drive the AD9252 with a single-ended signal, which eliminates the need for the transformer. Please see that page 18 (and figure 38) of the data sheet. Note that the performance specifications are not guaranteed in this configuration, but if your analog input frequency band of interest is also low then you can still probably realize good performance.
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