LMK00301: Bank A and Bank B of LMK00301 performance are not the same

Frank Xiao

Genius 12055 points

Part Number: LMK00301

Hi team,

My customer is using the LMK00301 now. Clkin0 input is 156.25M(positive clock), Bank A output is the same as clkin0 with no phase shift. But Bank B output is 30ppm negative phase shift. Whether it's normal? Thanks.

over 3 years ago

0 Aaron Black over 3 years ago

TI__Expert 5040 points

Hello Frank,

Could you include a few more details about the setup of this device? Please include the input and output types.

Thank you for the additional information!

0 Frank Xiao over 3 years ago in reply to Aaron Black

TI__Genius 12055 points

Hi Aaron,

Both input and output A&B are LVPECL interface. Thanks.

0 Aaron Black over 3 years ago in reply to Frank Xiao

TI__Expert 5040 points

Hello Frank,

Thank you for the info!

Let me get back to you soon.

0 Aaron Black over 3 years ago in reply to Aaron Black

TI__Expert 5040 points

Hello Frank,

Your original question, "Clkin0 input is 156.25M(positive clock), Bank A output is the same as clkin0 with no phase shift. But Bank B output is 30ppm negative phase shift. Whether it's normal?"

This device should not have such a large difference in Bank B output. I could not recreate this on the bench.

Does this persist to be an issue? Has the customer tried changing input frequencies and ppm shift persists?

0 Frank Xiao over 3 years ago in reply to Aaron Black

TI__Genius 12055 points

Hi Aaron,

The customer also cannot reproduce the phenomenon on the bench too. Thanks for your help.

Clock & timing

Clock & timing forum

LMK00301: Bank A and Bank B of LMK00301 performance are not the same