ST AN2483 APPLICATION NOTE
AN2483
Application note
Video signal standards
Introduction
As PC games, video editing, streaming movies on TV and DVD playback are becoming
more common, there is an increasing demand to display such video graphics on larger
display screens like those of TV rather than the PC monitors.
Analog switches are often used to route RGB data (Red, Gr een, Blue f o rmat) or component
or composite video data from different video sources, or to feed encoders with the video
data to different displays. The former is a multiplexing function while the latter is a demultiplexing function.
Interest in using analog switches in video signal routing applications is growing due the
rising trend of using lower pin count and the possibility of achieving cost reduction by
sharing the same video encoder/decoder or RAMDAC. This application note first describes
the video signal standards and then explains the various important parameters, which are
necessary to consider, in video signal sw itching.
May 2007 Rev 1 1/6
www.st.com
Contents AN2483
Contents
1 Video signal standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Composite/CVBS Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Y/C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Computer signal Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Component Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2/6
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