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How to configure the DAC38j84 to get the DAc PLL to lock?

Other Parts Discussed in Thread: DAC38J84
Hello, 
I have some trouble with the dac38j84 configuration : 
When i read the config108 register, i get 0x0007 (i do not use the serdes block 1,) which means the serdes PLL lock fine, but not the DAC PLL.
I can"t find why the DAC PLL won't lock, do you have any idea why?
In attachment the registers as i write them.
The DACCLK is running at 307.2 MHz and i want to run only DAC A and B with a 421(LMF) JESD204B.
0x00	0x0208 #config0
0x02	0x2080 #config2
0x1A	0x0007 #config26
0x22	0x1B1B #config34
0x23	0x0000 #config35
0x24	0x0000 #config36
0x25	0x0000 #config37
0x31	0x6408 #config49
0x32	0x0F00 #config50
0x33	0x0084 #config51
0x3B	0x0000 #config59
0x3C	0x0050 #config60
0x3E	0x0040 #config62
0x4A	0x0F3E #config74
0x4B	0x0000 #config75
0x4C	0x1F03 #config76
0x4D	0x0100 #config77
0x51	0x0000 #config81
0x6C	0x0000 #config108
0x4A	0x0F01 #config74 




















  
Thanks,
Regards
Mathieu Hanicotte