I'm designing a VGA generator and I have found nice and cheap video filter (ADA4430-1) that goes after DAC.
Its datasheet says that it has cutoff frequency around 10MHz. And that it is specially designed as video filter. I want 640x480, 60Hz, so my pixel clock (frequency at which pixels are changing) is 25MHz.
So now my question: If my pixels changes with 25MHz and filter is for 10MHz, so how and why this filter calls itself suitable for video?
I'm a little confused - what should be the frequency cutoff of such filter to operate with this 640x480 VGA (25MHz)?