I agree with Jari's comments, I was being over simplistic. A useful tutorial can be found at http://openlabtools.eng.cam.ac.uk/Resources/Datalog/RPi_ADS1115/.
Well I too may be well out of date on this but I think there are two kinds of CCD sensors around; line scan sensors and area scan sensors. They basicly do what the name says. Line scan sensors just have a single line of pixels where as area scan...