LMK04828: PLL lost lock

Ryker She

Expert 8270 points

Part Number: LMK04828

Tool/software:

Hi expert,

My customer is evaluating LMK04828 and met a issue as below, please help to confirm. Thanks.

The output of LMK04828 is normally locked when it power-on firstly. But the PLL2 would lost lock when R&D configure it again.

Best Regards,

Ryker

over 1 year ago

0 Connor Lewis over 1 year ago

TI__Genius 17500 points

Hi Ryker,

Can you share more details about the set up, such as schematics, .tcs configuration files, etc.?

Regards,

Connor

0 Ryker She over 1 year ago in reply to Connor Lewis

TI__Expert 8270 points

Hi Connor,

Please help to check below schematic and .tcs configuration files and confirm this issue. Thanks.

LMK04828_1.tcs

Best Regards,

Ryker

0 Connor Lewis over 1 year ago in reply to Ryker She

TI__Genius 17500 points

Hi Ryker,

Thanks for sending over the schematic and config files. I'm not seeing any obvious issues. What registers are being changed that cause PLL2 to unlock? Also are they re-calibrating VCO2 after making these changes?

Regards,

Connor

Clock & timing

Clock & timing forum

LMK04828: PLL lost lock