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ADS54J60 Questions

Other Parts Discussed in Thread: ADS54J60

Thanks for the earlier answers!,

Question1:    What does the ADS54J60  VCM output pin do when the part is in the power down state?
(i.e. does it remain on, float, or drop to ground)

Question 2:    In the ADS54J60 data sheet, Figure 15. Analog Input Network, the four amplifiers shown on the right edge of the diagram are shown for reference only and do not provide any additional loading on the Circuit,  Correct?

I am designing a very wide-band, 50 Ohm, DC Coupled, Ground Referenced Single Ended input, to Differential Output circuit with level shifting on the output to the drive the ADS54J60 Inputs.  I have my circuit and the 'Analog Input Network' loaded into LTspice;

Question 3:   Is it a correct assumption that If my matching circuit provides a flat frequency response across the 375fF caps at the inputs to the four buffer amplifiers in the Analog Input Network that I will get an optimum frequency response from the ADC?   

I ask this because providing a flat match to out to 1GHz at the INxP/M pins is not the same as a flat match to the 'amplifier inputs' in the 'Analog Input Network' and I would like to be measuring in the correct place.

Thanks