Davies Publishing SPI Practice Test

Converting stored digital brightness values into an analog voltage that drives the display brightness is the job of a digital-to-analog converter. The system keeps brightness levels as digital numbers; to produce the actual brightness, those numbers must become a voltage that changes smoothly with the input code. The DAC reads the digital word and generates a corresponding analog output voltage (or current), which the display driver uses to set pixel intensity. In contrast, an analog-to-digital converter would take an analog voltage and turn it into a digital value, not the other way around. The cathode ray tube is the display device itself, and a receiver isn’t involved in this brightness control. So the digital-to-analog converter is the component that turns stored numbers into voltages to control brightness.