TMC22071A

The TMC22071A Genlocking Video Digitizer converts stan-dard baseband composite NTSC or PAL video into 8-bit dig-ital 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 gen-locked 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 mul-tiplexer, analog clamp, variable gain amplifier, and digital back porch clamp. The on-board oscillator circuitry gener-ates the clock from a 20 MHz crystal or the clock source may be an external oscillator. It is programmable over a micro-processor interface for NTSC or PAL operation. No external component changes and no production tuning or service adjustments are ever required.