Mar 6, 2006 #1 A aoshater Newbie level 6 Joined Jun 19, 2005 Messages 11 Helped 2 Reputation 4 Reaction score 1 Trophy points 1,283 Activity points 1,425 LVDS or CML ? We are working on a project and i have been reading many datasheets of products similar to that we plan to design. I have noticed they always used LVDS for data that comes from data sources on the PCB such as network processors and frequencies around 600Mbps. They use CML for serial data of 2.5Gbps which goes to an optical module. But is that really the reason why they choose input parallel 600Mbps drivers as LVDS and output serial driver as CML? And in general, what is the major difference between CML and LVDS? Thank you
LVDS or CML ? We are working on a project and i have been reading many datasheets of products similar to that we plan to design. I have noticed they always used LVDS for data that comes from data sources on the PCB such as network processors and frequencies around 600Mbps. They use CML for serial data of 2.5Gbps which goes to an optical module. But is that really the reason why they choose input parallel 600Mbps drivers as LVDS and output serial driver as CML? And in general, what is the major difference between CML and LVDS? Thank you
Sep 2, 2010 #2 N Nixphe Junior Member level 1 Joined Aug 17, 2010 Messages 17 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Location BE Activity points 1,449 A Comparison of CML and LVDS for High - speed Serial Links - AN1202 - Cypress Semiconductor might help ... no idea if anyone is still looking at this old post
A Comparison of CML and LVDS for High - speed Serial Links - AN1202 - Cypress Semiconductor might help ... no idea if anyone is still looking at this old post
Sep 2, 2010 #3 D dick_freebird Advanced Member level 7 Joined Mar 4, 2008 Messages 8,988 Helped 2,333 Reputation 4,683 Reaction score 2,520 Trophy points 1,393 Location USA Activity points 71,585 One difference is that LVDS (TIA-644) has a well defined spec, while "CML" means different things to different vendors, logic families, etc. All you really know is that the signal is defined in terms of current levels.
One difference is that LVDS (TIA-644) has a well defined spec, while "CML" means different things to different vendors, logic families, etc. All you really know is that the signal is defined in terms of current levels.
Sep 20, 2010 #4 L love_analog Advanced Member level 4 Joined May 2, 2010 Messages 106 Helped 5 Reputation 10 Reaction score 2 Trophy points 1,298 Activity points 1,770 People tend to equate LVDS with lower current than CML. Typically CML is used for highest freq ~10G or so.
People tend to equate LVDS with lower current than CML. Typically CML is used for highest freq ~10G or so.