LMK04828: Problems were encountered in configuring clock output using TICS PRO software

IC anlord

Part Number: LMK04828

Tool/software:

At present, we want to use a piece of LMK04828 as the master clock,7 channels of DCLK output 0-2Ghz,7 channels of SDCLK output 10-20Mhz. The clock input of the chip Cin0 is 10M, Cin1 is 10M, Cin2 is 156.25M, OSCin is 100M, Cin0 and Cin2 are not connected at present. Using TICS_pro to configure the LVDS output of the full channel, but not all the channels can output the configured waveform. The 10M of SDCLK of the 7 channels seems to have no output. I hope you can help me see where there is a mistake in the configuration, or could you provide me with a configuration file of 2G plus 10Mhz for testing? Thank you very much! (Below is the schematic diagram of lmk04828 and the configuration file of TICS_pro I am currently using)

lmk04828_M.pdf 216_lmk04828cin0_10M_cin1_10M_osc100M.tcs

over 2 years ago

0 William Pfennigwerth over 2 years ago

TI__Expert 8421 points

Hello,

I apologize for the delay, I will get back to you early next week.

Regards,

Will

0 IC anlord over 1 year ago in reply to William Pfennigwerth

Prodigy 30 points

Hello，

Thank you very much and look forward to your reply！

0 William Pfennigwerth over 1 year ago in reply to IC anlord

TI__Expert 8421 points

Hello,

It looks like your SYSREF_PD was enabled, which would disable this SYSREF path. Uncheck it and try again.

Regards,

Will

0 IC anlord over 1 year ago in reply to William Pfennigwerth

Prodigy 30 points

Hello,

Thanks,Now the clock output of the full channel can be realized. Is it not possible to configure the clock output between 1500Mhz and 2300Mhz? VCO1 can only go up to 3000Mhz and the divisor can only be an integer.

0 William Pfennigwerth over 1 year ago in reply to IC anlord

TI__Expert 8421 points

Hello,

You could generate a clock output between 1500 and 2300, but you would have to set the VCO frequency to the desired output frequency and use divide by 1. All of your other outputs would have to be integer factors of your VCO as well. Could you give me the full list of frequencies that you require? With that I can see if another part is a better solution.

Regards,

Will

0 IC anlord over 1 year ago in reply to William Pfennigwerth

Prodigy 30 points

Hello，

DCLK is required so channel output 2Ghz and SYSREF output 10Mhz. At present, 1Ghz is used for testing, but the VCO1 is set to 3000Mhz and the divider is set to 3. The 1Ghz waveform output is somewhat truncated.So for the time being, 1250Mhz is being used out of 2500MhzCin1_10M_1.25Ghz+10M.tcs

0 William Pfennigwerth over 1 year ago in reply to IC anlord

TI__Expert 8421 points

Hello,

Ok, then the LMK04828 will work for you. It sounds like your 1GHz output is not working as expected? If this is true please share a scope capture or help me understand what your problem is. Otherwise I will consider this thread closed.

Regards,

Will

Clock & timing

Clock & timing forum

LMK04828: Problems were encountered in configuring clock output using TICS PRO software