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I have MAX9278 deserializer IC which is connected to a 3.1inch TFT display 800 (W) * 480 (H).

Deserializer provides 4 LVDS lanes and 1 clock to the display. While I checking the electrical voltage compatibility between the Display and the deserializer, both have a differential voltage levels of 1.125V to 1.375V. So, I believe they are compatible. But,

In the table "DC Electrical Characteristics" page 10 :

  1. Does the Output Offset Voltage "Vos" actually mean Common Mode Voltage?

  2. What does the "Change in VOS Between Complementary Output States - del(Vod)" & "Change in VOS Between Complementary Output States - del(Vos)" ? Can someone help me with a diagram on what does this mean?

1 Answers1

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  1. Does the Output Offset Voltage "Vos" actually mean Common Mode Voltage?

Normally, Common-Mode and Offset voltages are different things: Common-Mode voltage includes Offset, Noise, etc voltage.

  1. What does the "Change in VOS Between Complementary Output States - del(Vod)" & "Change in VOS Between Complementary Output States - del(Vos)" ? Can someone help me with a diagram on what does this mean?

First, there's a typo in the datasheet: The first parameter should be "Change in VOD Between Complementary Output States - del(Vod)"

The diagram at p.22 of the datasheet shows the signaling scheme.

enter image description here

When the differential signal swings from high to low or vice-versa, either the offset voltage (VOS) or the differential voltage (VOD) can shift. ΔVOS and ΔVOD indicate the maximum amount of these shifts guaranteed (I'm not sure about that, it may not be guaranteed) by the IC's design.

Rohat Kılıç
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  • Thank you for the answer. One question. Are VESA and oLDI different or the same or what are they? I couldn't find –  Jan 22 '21 at 06:49
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    @Newbie oLDI (a.k.a. open LVDS Interface) is the transmitting/receiving method of the signals. VESA is a mapping scheme that shows how 6- or 8-bit R, G, and B data signals are placed into the LVDS lines. – Rohat Kılıç Jan 22 '21 at 11:44