I am looking for an example of a video genlock pixel clock generate using a PLL synchronized to the video sync signals. Such things seem to be rather rare now as everything has moved to highly integrated parts designed for LCD displays.
My goal is to do a video overlay. To stop it juddering the clock of the microcontroller generating the overlay needs to be synchronized to the video clock. I found the AV9173 (or ICS9173 clone), which while not widely available does appear to do what I want. Unfortunately the datasheet is rather sparse (http://media.digikey.com/pdf/Data%20Sheets/IDT/AV9173-01.pdf) and refers to an "Application Brief (AB01)" which I can't find anywhere.
I found a solution in the EL4584/5, which offer various PLL locked pixel clocks and are somewhat available.