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LMK03318: low output LVDS common mode voltage

Genius 4105 points

Replies: 2

Views: 40

Part Number: LMK03318

Hi there

I noticed that AC-LVDS driver has very LOW output common mode voltage (Vos range = 150 to 350 mV) , BUT its Vod ( swing) could be 250-450mV. Section 8.15-8.16 of datasheet.

If we consider the extreme situation, the lowest voltage of output could become  150mv - (450mv/2) = -75mV, this is below the GND. Is this possible ? or did I miss something?  Same confusion with LVPECL output. 

Thanks!

  • Hello,

    Is your setup using DC coupling? 

    No, LVDS is a ground reference driver, so the Vos will not be negative. The Vos and Vod go hand in hand, in your example above you've taken the max Vod, with the minimal Vos, which is not how it would work. They very much trend together. 

    Thanks and regards, Amin 

  • In reply to Amin Eshraghi:

    Hi Amin

    Thanks for let me know Vos and Vod will trend together, the loweset voltage can be 150mv-250mv/2 = 25mv, it will not be negative.

    Yes we planned to use DC coupling, but now we decide to use AC coupling because its Vos  is too low for our receiver.

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