I'm using the TFP410 with a BT818 generating the RGB signal. I'm feeding the TFP410 a 38MHz IDCK+, but instead of seeing a 380MHz clock on TXC, I'm seeing the same 38MHz. Am I misunderstanding something? Shouldn't the output clock be 10x the input so it can encode the 8-bit RGB values?
I am a bit concerned with the output from the BT818. I configured it to use its internal clock instead of an external crystal and it looks like they might have depreciated that (it's not entirely clear from their datasheet). However, I do get a decent clock at 38MHz - albeit it is looking a bit sinusoidal. Is that my problem, or is there something else that might be preventing the TFP410 from locking the PLL to the higher frequency.
In the image from the scope, the yellow is IDCK+. Blue is TXC+.
Thanks,
mike
