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ADS52J90EVM: ADC output Clipping

Part Number: ADS52J90EVM

I am using TI's High speed ADC board ADS52J90EVM in JESD mode.  I am using Xilinx Zynq Ultrascale+ board  (zcu102) to read ADC samples using JESD204B interface.  

I am able to see samples in ILA . 

1-  I am able to see the RAMP test patterns on ILA (as shown in figure 

2- I am to get the custom test pattern on the ILA as well ( as shown in fig ) 

3- when i tried to see the external input signal ( sine wave, Ramp signal ). the output ( ADC_1 , i see in the ILA ) is a clipped off . ( as shown in figure ).  

I have tried to change the amplitude and frequency of the external signal, but i receive the similar waveform ( for both sine and ramp signal)  in FPGA. 

Could you please help me out with this problem ?