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High Speed DAC Buffer?

Hello

I need an urgently answer.

I want to place a ultra low distortion op amp to buffer the output of a high speed 14Bit-DAC as below:

The output frequency is DC-50MHz.

if I want to have the maximum CMRR I should minimize any mismatch  between the Rg and Rf.

on the other hand i want to have the maximum SFDR.

can I use a resistor network instead of Rf and Rg?

I found some kinds of such networks from Vishay and other companies.

the network mismatch is only 0.01%. the resistor inside the Network are completely isolated.

Best Regards

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