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DS250DF810: Double AC coupling due to internal capacitors with SFP+, zQSFP+ (QSFP28) at 25G

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Part Number:DS250DF810

 We will be using the DS250DF810 for retiming  25G RX signals between either a QSFP28/SFP25 and  a FPGA.

 

The DS250DF810 has 220pf DC integrated blocking capacitors (AC coupling) on the high speed signals. The QSFP/SPF devices also have integrated AC coupling capacitors on both TX and RX sides.  Only the RX side from the QSFP28 to the FPGA is required to be retimed, so my question is, are there any known performance issues or layout restrictions  due to the “double” coupling caps present?  This would be in the RX path QSFP to retimer.  See below.

 


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