Soo.. I've been testing my designing limits, trying to learn about Serial Digital Interface, and building a simple reclocker with TI IC's. And now I've run into a small speedbump with the output from the cable driver IC, LMH0307.
As you can see in the picture below (Taken from the LMH0307 datasheet), both SDO and it's complement !SDO are apparently being connected to coaxial cables and transmitted. This seems really weird to me, as SDI is designed for transmitting over a single cable. And as far as I know, it's not supposed to be connected to the shield, because that's straight-forward GND or floating on one side (again, AFAIK), and !SDO is not the same as a return path for SDO.
And when I look at the input of the cable equalizers in the same series (the LMH0394 etc, see below), I see that !SDI is connected to GND, through a cap and a resistor. In other words, this IC does not bother with the complement input at all.
So, what is the best practice on terminating the complement output from the cable driver, when I obviously can't/shouldn't do what's in the datasheet?
-- Thanks, Araho