AD9517-3 differential clock input in REFIN is lost

Dear,

First, thank you for your attention to my issue.

I use the AD9517-3 clock generator with 200MHz differential reference clock in REFIN1 and REFIN2, and the reference clock is LVDS and ac-coupled.

It's weird that when the two 0.1uF coupling capacitors are soldered on the board, the 200MHz differential clock is lost. When removing the capacitors, the 200M reference clock could be measured by the oscilloscope. What could be the reason? During the SPI configuration, the register at 0x01C has been configured to be 0x01, which means enabling the differential clock input, to my knowledge.

The following is the configuration file, generated through the  AD9516_17_18Setup2.1.1 software. Please have a check. 

"AD9517 Setup File"
"Rev.","1.1.0"
""
"Addr(Hex)","Value(Bin)","Value(Hex)"
"0000","00011000","18"
"0001","00000000","00"
"0002","00010000","10"
"0003","01010011","53"
"0004","00000000","00"
"0010","01111100","7C"
"0011","00000100","04"
"0012","00000000","00"
"0013","00000000","00"
"0014","00000101","05"
"0015","00000000","00"
"0016","00000100","04"
"0017","00000000","00"
"0018","00000001","01"
"0019","00000000","00"
"001A","00000000","00"
"001B","00000000","00"
"001C","00000001","01"
"001D","00000000","00"
"001E","00000000","00"
"001F","00001110","0E"
"00A0","00000001","01"
"00A1","00000000","00"
"00A2","00000000","00"
"00A3","00000001","01"
"00A4","00000000","00"
"00A5","00000000","00"
"00A6","00000001","01"
"00A7","00000000","00"
"00A8","00000000","00"
"00A9","00000001","01"
"00AA","00000000","00"
"00AB","00000000","00"
"00F0","00001000","08"
"00F1","00001000","08"
"00F4","00001000","08"
"00F5","00001010","0A"
"0140","01000010","42"
"0141","01000011","43"
"0142","01000010","42"
"0143","01000011","43"
"0190","00000000","00"
"0191","00000000","00"
"0192","00000000","00"
"0196","00010001","11"
"0197","00000000","00"
"0198","00000000","00"
"0199","00100001","21"
"019A","00000000","00"
"019B","00000000","00"
"019C","00100000","20"
"019D","00000000","00"
"019E","00110011","33"
"019F","00000000","00"
"01A0","00000000","00"
"01A1","00100000","20"
"01A2","00000000","00"
"01A3","00000000","00"
"01E0","00000000","00"
"01E1","00000010","02"
"0230","00000000","00"
"0231","00000000","00"
"0232","00000000","00"
"","",""
"Other Settings..."
"REF 1:",200
"REF 2:",30.72
"VCO:",2000
"CLK:",1200
"CPRSet:",5100
"Auto Update:",1
"Load All Regs:",0

Thanks ahead.

Chunjie