DS280BR810: Can I use two or more this IC in one link?

Faure Katie

Prodigy 10 points

Part Number: DS280BR810
Other Parts Discussed in Thread: DS280DF810

Tool/software:

here i have a link like below:

FPGA --> connector --> cable --> connector --> DS280BR810 --> connector --> DS280BR810 --> QSFP module

can this work? in one link with two or more DS280BR810.

2 months ago

0 Drew Miller1 2 months ago

TI__Mastermind 21132 points

Hi Faure,

It is generally not recommended to cascade redrivers because redrivers only compensate for ISI due to channel insertion loss. They do not remove jitter as effectively as retimers.

Is this for 25GbE application? Have you considered DS280DF810?

Also, can you share estimated insertion losses within your system?

Thanks,

Drew

0 Faure Katie 2 months ago in reply to Drew Miller1

Prodigy 10 points

Hi Drew:

yes, this is a 25GbE application, you mean i can use a DS280DF810 replace DS280BR810?

just like below?

FPGA --> connector --> cable --> connector --> DS280BR810 --> connector --> DS280DF810 --> QSFP module

The insertion loss of my system is around -40dB or higher, I think.

0 Lucas Wolter 2 months ago in reply to Faure Katie

TI__Genius 17325 points

Hi Faure,

Yes I believe the above configuration will be better suited for your application. If you are interested, I can share IBIS-AMI models for DS280DF810 and DS280BR810. These can be useful to perform simulations and build confidence in the design.

Best,

Lucas

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DS280BR810: Can I use two or more this IC in one link?