Designing ADC driver circuit
Well you haven't said what your supply voltage is or what is wrong with the output but this might be a clue: -



For the inductor, the higher the Q the less damping there will be in the L-C filter. This can be a good thing (and a bad thing i.e. it may create unwanted overshoot with transients).

The self resonant frequency is specified because the inductor has parasitic parallel capacitance and this will form a resonant circuit with the inductance - this area generally is to be avoided but in your circuit (low pass filter) I don't think a SRF above a GHz will be much trouble. Whatever the SRF is, it will form a parallel blocking impedance at SRF.