3 ms·

> the adapter itself is completely passive I think it was not completely passive, but simple level conversion; DisplayPort is AC-coupled signal, HDMI is DC-cou

• dfox 2y ago
  There is a difference between DP+ and DP++. DP+ uses external level shifter, DP++ uses passive adapter and the card switches different transmitter into the path internally.
• kayson 2y ago
  Signal level and coupling are separate things.
  • eigen 2y ago
    > Signal level and coupling are separate things. sure, but the part is called a level shifter. MAX9406 DisplayPort to DVI™/HDMI Level Shifter https://www.analog.com/en/products/max9406.html https://www.analog.com/en/products/max9406.html
• mikegoelzer 2y ago
  > I think it was not completely passive, but simple level conversion; DisplayPort is AC-coupled signal, HDMI is DC-coupled. Wait, I don't think that's accurate. I've worked with HDMI/DVI and both are AC-coupled, that is, you put a 10 or 20 nF cap in series on the TMDS lines if you're driving directly from an FPGA's digital IO pins.