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Altera_Forum
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18 years ago

About cyclone II diferential LVDS pins

I want to ask about cyclone II diferential pins with interface like LVDS, can these diferntial pins be used as Comparators ??? and how acurate they are? and will they realy work as comparators ??...
Altera_Forum's avatar
Altera_Forum
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18 years ago

To day I tested LVPECL differential clock pin and they worked too. actually these lvpecl pins are better suited for such ADC converter because their working range is higher till 3.3V with same 100mv threshold level so I got extra 8 adc levels by 100mv steps :).

bad thing is that my Ep2C8 have just 4 differential LVpecl comparators :( and one pin is using 16Mhz clock so I have just 3 usable LVPECL pins for ADC conversion I also checked other cyclone series fpgas and they all have these LVPECL pins just at clock pins so their count is very small :(