TMC22071A

www.fairchildsemi.com TMC22071A Genlocking Video Digitizer Features Fully integrated acquisition 3-channel video input multiplexer Two-stage video clamp Automatic gain adjustment Sync detection and separation Pixel and subpixel adjustment of HSYNC-to-Video timing Genlock to NTSC or PAL inputs Clock generation 8-bit video A/D converter Microprocessor interface Line-locked pixel rates - 12.27 MHz NTSC - 13.5 MHz NTSC or PAL Direct interface to TMC22x9x encoders Built-in circuitry for crystal oscillator No tuning or external voltage reference required 68 Lead PLCC or 100 Lead MQFP package Description The TMC22071A Genlocking Video Digitizer converts standard baseband composite NTSC or PAL video into 8-bit digital composite video data. It extracts horizontal and vertical sync signals and generates a pixel clock for the on-board 8-bit A/D converter and a 2x clock for the transfer of data to subsequent video processing decoding or encoding with the TMC22x5y Video Decoder or TMC22x9x Digital Video Encoder family. It also measures the color subcarrier phase and frequency and provides this data to the Encoder (for genlocked color NTSC or PAL encoding), or a frame buffer (for frame capture) over the digital composite video port. The TMC22071A includes a three-channel video input multiplexer, analog clamp, variable gain amplifier, and digital back porch clamp. The on-board oscillator circuitry generates the clock from a 20 MHz crystal or the clock source may be a...