The system has been designed to operate from a 12-V supply with all digital level controls operating over a 0-V to 4-V range to make the interface to serial digital buses possible. The TLS1255 also contains a blanking circuit that clamps the video output voltage to within 0.2 V of ground. The mixer circuit required for the OSD application is also integrated into the TLS1255, which makes the design of video boards and other applications easier.