AD9250 data through optical transceiver SFP+

Hi Rleduc ,

I haved moved this thread here (+) Q&A - High-Speed ADCs - EngineerZone (analog.com). Someone here should be able to assist you in your queries.

Regards,

JC

Hi Rleduc,

Thank you for your interest in AD9250.

I'm not an expert on FPGA/SoC or the optical fiber application but I'll try to give comments.

For the usage of the SFP+ 10Gbe to send the 5 Gbps signals, the 250 MHz one, and the DC one directly to AD9250. I can't recommend you doing this. 
1. I'm not sure if this is feasible, you can ask the support of Terasic for the usage of the HAN pilot board related to using SPF+ 10Gbe to directly interface with JESD204B.
2. For the clock source of AD9250. Instead of sourcing this from an FPGA, I highly suggest providing a dedicated 250MHz low jitter clock source as this highly affects the performance of the ADC.

3. For the JESD204 Interface, why not use the HPC FMC of the Terasic HAN Pilot to communicate with the AD9250, and let the SoC FPGA on board handle transmitting the data thru the SPF+? Can you consider this option instead of directly interfacing the AD9250 using SFP+ 10 Gbe?


The AD9250 evaluation board is FMC compatible. You may check this link for the Wiki guide on EVALUATING THE AD9250/6673 ANALOG-TO-DIGITAL CONVERTERS [Analog Devices Wiki].


Best regards,
Peevee

Hi Peevee,

Thank you for your prompt answer.

In fact we already have our AD9250 remote FMC board that indeed, we use to directly plug onto the HAN pilot plateform. This works very fine and we could validate transactions with the JESD204B protocol.

Now we want to move further, the idea is to actually have this remote acquisition board operating "on-site", transmitting data over long distance (~100m) to a local SoC FPGA plateform. This is mandatory to be done through optical fiber because of EM hazardous environment.

Even if we don't use the provided SFP+ connectors from HAN Pilot, you are right we may add on optical fiber interface card using FMC connector such as the following :

So in this way we may not face pin constraining from the HAN pilot SFP+ connectors. I will ask them for this.

Otherwise, I will continue looking for other optical fiber specs, is there any forum on ADI that could me more related to optical fiber or transceiver ?

Thanks,

Regards, 

Hi Rleduc,

Thank you for sharing this information.

This is interesting. I'll ask my colleagues about this and see who can provide guidance related to this.

Best regards,
Peevee

Hi Rleduc,

I got some info from our JESD204B experts.

We have never done this ourselves but there are other customers that have done this before. Although we won't be able to provide necessary guide how to establish the optical link, there are plenty of information on the optical link on the internet. You need to ensure they are recovering the signal accurately at the optical receiver (checking the appropriate specs). As long as that happens the JESD will be fine.

Hope this helps.

Best regards,
Peevee

Hi Peevee,

I believe the SFP connectors (socket) may not be a problem, or even passive modules (copper SFP cables). However for active modules a.k.a. optical SFP modules, the supplier may provide specifications for its drivers/receiver technologies which are their own. I will ask them, and read a bit more about optical link aswell ;) .

Thanks for your insight,

Best regards,