The AD9208 is used for signal acquisition, and it is found that the acquired signal has large burrs.
The following figure shows the waveform of 3000MHz sampling clock and 10MHz sampling signal. Two AD9208 chips are used to collect four channels of data：
The following figure shows the waveform without input
When using the test pattern (0x0573) in the adc, the data looks normal, that is, the adc output side is OK
No similar burr is found in the power supply and input signal when the oscilloscope is used to test the board.
Internal voltage reference mode adopted in board design as follow：
What I want to ask is where the problem is and which direction to investigate