What is the output impedance of the Baseband Amplifiers for the AD8347? Can these outputs (QOPN/QOPP, IOPN/IOPP) be used to directly drive a differential input ADC, or is it recommended to have some series resistance and shunt C at the ADC input?
AD8347 internal baseband amplifiers can be be directly interfaced with an ADC. Please also note that the Baseband Amplifier typical performance data is given with Rload=10K. You may also want to place a filter between the amplifier output and the ADC. In this case, it may not be practical to match the low impedance output to a high impedance ADC input and then you can add series resistors to amplifier outputs to help LC filter see a matched source load.
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