DS250DF410: Application issues related to chips

Hi,

Your schematic is not attached to this thread.  Please share if it's important for your questions.

Tonyx.wu said:

1. Does a QSFP28 100G port use 2 pieces of DS250DF410, and one piece (schematic bit U68) of CAL-CLK-OUT must be connected to the other piece (schematic bit U70) of CAL-CLK-IN? Or can we provide separate clocks for the two chips?

You can cascade the CAL CLKs from U68 to U70, or you can provide two separate clocks for the two devices.

Tonyx.wu said:

2. Taking the schematic diagram in the attachment as an example, U68 and U69 chips are used for PORT1 and PORT2 respectively. For wiring considerations, can the CAL-CLK-OUT of U68 be connected to the CAL-CLK-IN of U69?

Yes, you can cascade CAL CLKs from U68 to U69.

Thanks,

Drew

Hi,

Please find feedback on your schematic attached.  Let us know if you have any questions.

DS250DF410_Schematic_Review.pdf

Thanks,

Drew