Some companies requires you to create an account on their websites to download a datasheet, which is annoying, but at least you can see the datasheet immediately after registering. Looks like Intersil doesn't want to sell parts, because after the required registering, when I click "Request Full Datasheet", this message appears:
No response so far from the Product Line Marketing manager (I love marketing). I understand it for very modern or special parts which require a NDA, but a simple 5 dollar video ADC? Thank you very much, I'll take a look at the same TI or Analog Devices parts.