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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I'm an avid electronics hobbyist and a talented programmer with a passion for creative problem-solving, design, and systems integration. As a member of the Creltek design group, I enjoy finding elegant solutions to complex problems, and combining hardware and software in new and unique ways. I maintain an extremely wide range of interests, and strive to stay on the cutting edge through constant innovation and application, both at work and during personal pursuit in my free time.
My current electronics research includes LED lighting, resonant high-frequency switching power supplies, embedded systems, multi-core microcontrollers, digital audio and MIDI, and the design of reusable circuit modules for rapid prototyping, research, and development.
My day job involves managing the IT department and teaching at a small private college. You can check out my LinkedIn profile here: https://www.linkedin.com/in/kevpatt
Creltek is a private technology design group engaged in innovative software and hardware integration, research, and development. We strive for high quality and excellence by design. When a member of our engineering team creates a module or tool that might be useful to others, we try to make it available here on Tindie!
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