207299-1

Description

The TMC2072 Genlocking Video Digitizer samples and quantizes standard analog baseband composite NTSC or PAL video into its 8-bit digital equivalent. It extracts horizontal and vertical sync signals, from which an on-chip PLL generates a line-locked pixel clock for the on-chip 8-bit A/D converter and a double-speed register clock to transfer data to a subsequent video processing subsystem. A second PLL generates a chroma subcarrier locked to the incoming chroma burst. The chip reports each line’s color burst phase and frequency during the next horizontal sync pulse.

Features

• Fully integrated acquisition
• 3-channel video input multiplexer
• Two-stage (analog and digital) video clamp
• Automatic gain adjustment
• Sync detection and separation
• Pixel and subpixel adjustment of video-to-sync output timing
• Genlock to any NTSC or PAL format, including PAL-M and PAL-N
• Pixel clock generation
• 8-bit video A/D conversion
• Standard R-bus serial microprocessor interface
• User-selectable line-locked pixel rates include:
– 12.27 MHz NTSC & PAL-M
– 13.5 MHz NTSC & all PAL
– 14.75 MHz PAL (non-M) TMC2072-1 only
– 15.0 MHz PAL (non-M) TMC2072-1 only
• Direct interface to Fairchild Semiconductor video encoders and decoders
• Built-in circuitry for crystal oscillator
• No tuning or external voltage reference required
• Space-saving 100-lead MQFP package

Applications

• Frame grabber
• Digital videotape recorders
• Desktop video