Santa Clara, Calif. National Semiconductor Corp.'s video decoder is said to increase compatibility between different video standards allowing consumers to output video directly from DVD players, gaming devices and other devices to their PC monitors.
National claims this is the first decoder with an integrated 2:1 multiplexing (MUX) video switch that uses analog technology to accurately convert standard and high-definition video (YPbPr) signals to a computer video (RGB) format.
The LMH1251 also performs all the necessary sync processing to generate horizontal and vertical sync signals from standard (SD) and high-definition (HD) video formats.
National's LMH1251 converts video to within 1 percent accuracy based on vector scope analysis. The device accepts one set of YPbPr inputs and one set of RGB/HSync/VSync inputs. Using the integrated 2:1 MUX and based on the input selected, the output will be either a decoded TV or buffered PC video signal. The LMH1251's RGB path has 400 MHz of bandwidth, enabling it to accept up to 1600 x 1200 UXGA video resolutions. The output displays the unaltered RGB video signal.
The YPbPr video path has 70 MHz of bandwidth. It is equipped with a smart video detection circuit that automatically senses 480i, 480p, 720p, 1080i and 1080p video formats, applying the appropriate color-space conversion and outputting the video in a RGBHV format. The LMH1251 eliminates the need for a microcontroller to choose the proper detection scheme.
"Converting signals in the analog domain through National’s integrated, all-in-one decoder gets rid of all the complex external circuitry or additional chips you'd find in a digital solution," said Erroll Dietz, vice president of National Semiconductor’s amplifier products group.
The LMH1251's conversion process is done using analog technology via a color-space conversion matrix, eliminating the multiple stages of digital implementations. The result is a cleaner, crisper decoded video image that is superior to alternative approaches that use discrete components, digital products or field-programmable gate arrays (FPGAs), according to Dietz.
See related block diagram
Available now in a TSSOP-24 package, the LMH1251 is priced at $3.49 in 1,000-unit quantities. Lead-free package options are also available. Click here for the LMH1251 data sheet.
National Semiconductor, 1-800-272-9959, www.National.com.