Digital Video Encoders/Layering Engine

The TMC22x91 digital Video Encoders convert digital com- puter image or graphics data (in RGB, YCBCR, or color indexed format) or a CCIR-601 signal into a standard Analog baseband Television (NTSC or PAL) signal with a modulated color subcarrier. Both composite (single lead) and S-VIDEO (separate chroma and luma) formats are active simultaneously at the three Analog output pins, each of which generates a standard video-level signal into doubly-terminated 75 load. The TMC22x91 accepts digitized Video from the companion TMC22071 Genlocking Video Digitizer. Soft switching between Video sources is done under either hardware or programmable data control. The TMC22191 offers 4-layer keying capability, bypassable CLUT, and 30 Overlay colors. The TMC22x91 is fabricated in a submicron CMOS process and packaged in an 84 Lead Plastic Leadless Chip Carrier or in a 100 Lead Metric Quad Flat Pack. Performance is guar- anteed from 0C to 70C. By Fairchild Semiconductor