Hello、I get some problem to be resolved when using DAC38RF93.
1,when i using the DAC PLL, the reference frequence is 500MHz,PLL-N=1,pll_m=5, I choose the LOW VCO, I want to know the value of pll_vco value I shoud set if I need the VCO out put frequecy is 6G?
2, In the datesheet PAGE 141, the figure 167 tell us we can not operate the register until we we get the bit [15 : 11]=10000 by reading the register address "7F",however the alue i get is always"000000". I ignore about this step and still configure the register,i seems that the date can be written into the register i need. So, I doute is there any problem?
3, the sample rate i use is 3Ghz, 84111 with 2 TX, dual DAC with signle link ,the actual state i want the two DAC cahnnel work independently, rx 0-3 for DACA and rx4-7 for DACB, THE FOLLOWING SEQUENCE IS REGISTER I SET:
09:0003 0A:0610 OC:26A0 0D:8001 19:0001 20:4CCC 1F:CCCC 1E:CCCD 25:6600 27:1144 28:0440 09:0001 4A:0F03 09:0002 4A:F003 09:0003 4B:1300 4C:1303 4D:0100 4E:0F4F
In the FPGA ,i set THE L=8, F=1,K=20,THE frequecy of the sysref is 3.125M
but I can not get the SYNC signal high. is there any problem in my setting.