Serial to parallel LTC2325 cannot get the correct waveform

 The amplifier I didn't use the recommended LT1819, I used ADA4927-2, may be the reason is incompatibility.

I used signal generator to input sine wave(100MHz, Vmax=1V, Vmin=0V), but I cannot get the correct waveform from the function "set up debug" of software Vivado.