Analog video output board with on-board 24-bit RGB DAC, TV encoder (PAL/NTSC), and VGA, S-Video, and Composite (RCA) connectorsDesigned by Kevin H. Patterson, Ships from United States of America
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Creltek Video DAC The Creltek Video DAC allows the conversion of 24-bit parallel RGB pixel data (sometimes called a "TTL" or "Parallel" interface) to a variety of analog video output formats, inc...Read More…
The Creltek Video DAC allows the conversion of 24-bit parallel RGB pixel data (sometimes called a "TTL" or "Parallel" interface) to a variety of analog video output formats, including VGA as well as S-Video and Composite video signals, which are commonly used in standard-definition television.
The board includes a high quality 24-bit RGB video DAC supporting a maximum pixel clock of 180 MHz. This DAC produces a very clean output that is far superior to what you can get from simple R2R resistor networks or other DACs that are not designed for video. Also included is a high-quality TV Encoder, which provides simultaneous S-Video and Composite video outputs and produces a beautiful picture on TV. A set of 3 jumpers allows you to route the DAC's video output to either the VGA port or to the onboard TV Encoder. (Please note that both VGA and TV Output cannot be used simultaneously; it wouldn't make sense anyway since there are no standard-definition TV modes that correspond with standard VGA timings.)
The onboard TV Encoder can be set to either PAL or NTSC encoding standards, with the installation of the appropriate crystal and jumper setting. PAL requires a 4.433618 MHz crystal with the "PAL" jumper closed, and NTSC requires 3.579545 MHz crystal with the "PAL" jumper open. The crystal is socketed, allowing it to be easily changed. The inclusion of either or both standard crystals is available as an option when ordering.
The onboard Video DAC operates on 3.3V power, while the onboard TV Encoder operates on 5V power. The board itself requires a single 5VDC power supply (an onboard linear regulator supplies 3.3V power to the Video DAC). NOTE: All digital inputs and control signals are specified for 3.3V CMOS levels, and should only be interfaced with 3.3V logic.
NOTE: This board is a "Video DAC + TV Encoder" ONLY. It does not include a frame buffer, and does not generate your pixel clock, pixel data stream, or sync pulses. It's up to you to supply the board with appropriate signals including parallel pixel data, pixel clock, and horizontal and vertical sync pulses. This can be accomplished with a sufficiently powerful microcontroller, FPGA, or other system providing parallel digital video output.
Additionally, several small ground pads are provided along the edge of the board if additional ground connections are needed for shielding or noise reduction purposes. These are located to the left of pins 0, 8, 16, 24, and 25.
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