Here are some tips and tricks to help connect up to video sources and displays. First, use BT.656 whenever possible because it eliminates a lot of timing incongruities and inconsistencies that can crop up in an application. So when you have the choice, go for 656. Also pay close attention to the default converter settings for whatever A to D or D to A you’re using because often times you’ll find that you might be operating in a mode that you didn’t expect. A lot of times you’ll be able to use these converters directly without programming through an I²C or SPI interface, but sometimes you’ll also want to verify through the feedback channel of I²C that you do have the device configured to the appropriate settings.