LMK04208: External Sysref clock input through LMK04208 CLKout1 Port

Mehali Pahari

Part Number: LMK04208

My query is in context to the LMK04208 on the ZCU111 board. The UG1271 on page 55 highlights that external sysref can be provided through ZCU111 Sysref SMA with some on board capacitor modifications. These SMAs are connected to the CLKout1 P/N connections of the LMK04208 as verified from the board schematic. Please suggest or elaborate how to configure the Programmable Output Port as an external input clock.

over 1 year ago

0 William Pfennigwerth over 1 year ago

TI__Expert 8421 points

Mehali,

I will look into this and get back to you early next week.

Regards,
Will

0 Mehali Pahari over 1 year ago in reply to William Pfennigwerth

Prodigy 10 points

Thank you for your time Will, but a detailed analysis of the schematic showed that on modifying the capacitors from default locations to the external locations, directly feeds the external clock into the RFSoC and not into the CLKout1 P/N connections of LMK04208.

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LMK04208: External Sysref clock input through LMK04208 CLKout1 Port