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Altera_Forum's avatar
Altera_Forum
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16 years ago

Interfacing to S4/S3 LVDS

Hi All, I would like to interface an ADC that has a Vocm of 820mV at 780Mbps to the S4 LVDS receiver. The S4 data sheet has the Vicm at: 0.05V < VICM < 1.8V for Dmax less than 700Mbps a...
Altera_Forum's avatar
Altera_Forum
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16 years ago

My personal feeling is that you won't have any issues if you just directly connect the two together (dc coupled).

However, if you're concerned:

My first suggestion would be to use an LVDS buffer from either Micrel or On semi:

http://www.onsemi.com/pub/collateral/nb4n527s-d.pdf

http://www.micrel.com/_pdf/hbw/sy58605u.pdf

My second suggestion would be to use an AC coupling scheme with DC bias. This document might be helpful:

http://focus.ti.com/lit/an/scaa059c/scaa059c.pdf

Jake