high speed LVDS characteristic impedance

[emanueay]

Greetings,

 

I need to know what is the output characteristic impedance of the VHDC connectors on the Genesys Virtex 5 FPGA Develpment Board. The datasheet only says they are impedance-controlled matched pairs and the schematic does not have this info. Some online forums said SCSI is defined by ANSI X3.13, the nominal diff cable impedance is 122 Ohms and I want to check if my board IO is consistent with this standard or not. I need to design a mating board to convert high speed differential signals into single ended, and signal integrity is a big deal.

 

Thanks in advance,

Emanuel

[JColvin]

Hi Emanuel,

I have asked some of our applications engineers about this; they'll get back to you here on the forum.

Thanks,
JColvin

[Bianca]

Hello Emanuel,

The connector does not have controlled impedance. On the board we have 50 Ohm single ended and 100 Ohm +/- 10% differential. 

Best regards,

Bianca