Hello, Can you please help me with the problem I meet .
When using AD9164 outputs 1GHz to 3GHz RF signal, sweep frequency step is 50MHz, sometimes AD9164 changed to no output at 2.4GHz and then all frequency is no output.
Change the output sweep frequency range to 3GHz to 5GHz, sweep frequency step is 50MHz, sometimes AD9164 changed to no output at 4.8GHz and then all frequency is no output.
Sometimes, AD9164 changed to no output at other frequency, but the probability is very low.
After restarting AD9164, AD9164 output get right.
When AD9164 outputs 2.4GHz or 4.8GHz signal continuous, this problem will not happen.
When change the sweep frequency step is 1MHz or 5MHz, this problem will improve.
When decrese level of output power, this problem will not improve.
JESD204B frequency is 4.8GHz, I don't konw is there any collections between it?
I don't understand why AD9164 outputs 2.4GHz or 4.8GHz signal continuous, this problem will not happen.
I don't konw how to solve this problem and I need your help.
Thanks and regards
Could you please let us know how you have configured the DAC. We need to know the configuration parameters.
Also, let us know if this one of ADI's eval boards or it is a custom designed board.
Thanks for your reply.
It's a custom designed board of AD9164.
The frequency of DAC Clock is 11.52GHz, Interpolation Rate is 12, the number of Lanes is 4, lane Rate is 4.8GHz, PCLK rate is 120MHz.
I found that syncout signal will be low when AD9164 is no output. When I use vco only mode, the problem will not happen.
The lane Rate is 4.8GHz, and the frequency of problem is 2.4GHz and 4.8GHz, it seems to matter.
I will provide configuration parameters, but it's too many. I want ask you which aspect's configuration parameters is more useful? I will prepare as soon as posiible.
Thanks and regards
NCO only mode，not vco only mode
Is it true that you are clocking the DAC with 11.52GHz? this is not possible that the DAC can work with this Clock rate. Could you please confirm this, first.
My guess is that you have a clocking issue. We need to understand your setup. But first I need to make sure that you are not clocking the DAC with more than 6.4GHz clock.
Thank you for your reply!
The clock of DAC is 5.76GHz and DAC Update Rate is 11.52GHz. I'm sorry for this information error.
Here is the configuration information.
Configure DAC Start-Up Sequence After Power-Up 0x18->0x0000x01->0x2000x52->0x0D20xD2->0x0D20x02->0x6060x00->0x6070x01->0x6040x03->0x0580x1E->0x0900x00->0x0800x00->0x0400x0F->0x0200x85->0x09E0xE9->0x0910x20->0x0E80x00->0x152Configure JESD204B Start-Up Sequence 0x00->0x3000xFF->0x4B80x01->0x4B90x38->0x4800x38->0x4810x38->0x4820x38->0x4830x38->0x4840x38->0x4850x38->0x4860x38->0x4870x46->0x1100xC5->0x1110x08->0x2300x01->0x2890x00->0x0840x37->0x3080x25->0x3090x02->0x30A0x19->0x30B0xF1->0x3340x00->0x2000x09->0x4750x08->0x4770x0F->0x4580x2f->0x4590x83->0x453SUM(0x450 to 0x45C)->0x45D0x01->0x4750x00->0x47D0x0F->0x2010x01->0x2A70x01->0x2AE0x1F->0x29E0x00->0x2060x01->0x2060x42->0x2680x03->0x280Configure NCO Sequence 0x7F->0x14E0x7F->0x14F0x00->0x1500x10->0x113
Looking forward to your reply.
Thank you very much!