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Hi Henry,
Please see below for modification to the input circuit while driving the THS770006 in single-ended to differential configuration from a 50-ohm source.
If you are driving the device with a 50-ohm source, then it is not necessary to have the R342 (or make it DNP). But then, you would have to make the 25-ohms connected on the un-driven input as 50-ohms for getting a balanced impedance looking into the device inputs.
I would also make the R322 and R323 as 49.9 ohms to attenuate any charge kick-back that could occur at the amplifier outputs while sampling the inputs at the ADC.
Best Regards,
Rohit