描述 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.

特性 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