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AD9251 FDA

FDA input ZIn

My question.  In the datasheet fig 41 shows a recommended differential driver (FDA) interfacing to the ADC diff inputs.  It looks like the Zin of the amplifier is appx 50ohms.  I have a case where I could drive this FDA with another op amp but using a higher load than 50ohms would be easier.  Most op amps cannot drive 50ohms directly so I would need to use a series 50ohm to limit current.  Is it possible to reconfigure the FDA input a bit to make it maybe 200-500 ohms?  Any circuit suggestions?  Freq of operation is <= 1MHz.