Other Parts Discussed in Thread: TFP410
We have had two DVI chips (the TFP410) that have not worked. One was on initial power up and another was after testing for a while. I suspect it is the setting we have on VREF but the datasheet is not clear enough. The datasheet says "For low-swing input signal levels, VREF should be set to half of the maximum input voltage level. See
Recommended Operating Conditions for the allowable range for VREF." We then set it to 0.9V since our signals coming from the FPGA have a signal voltage of 1.8V. But when you look at the recommended operating conditions it says the 0.9V is the max. I am wondering if setting it at the max might make some parts fail because of tolerances.
What happens when the voltage is above 0.9V?
It is not clear would switch over to "High-swing mode"
I am not asking if this can damage the part, I am wondering if the part was not working because it was not in low-swing mode.. What I am wondering is if the VREF is set to 0.92V, is it absolutely sure that the part will be in low swing mode? How about 1V? How about 2V? How about 2.5V, 2.9V, etc...
