Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

does altlvds have termination 100 ohm setting_

In my Desin, receiver pins from ADC are set to LVDS. According to http://www.altera.com/literature/hb/stx2/stx2_sii52004.pdf (https://imail.datarespons.com/owa/redir.aspx?c=7c40eefd45214092bdb96d...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Hi Dave,

Thanks very much for the information.

Quartus II v11.1 says

"Stratix devices support internal differential termination with a nominal

resistance value of 137.5 Ω for LVDS input receiver buffers."

Strange, it needs 100 Ω, but the internal resistance is 137.5 Ω, why?