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National Semiconductor announced the industry's first decoder with a built-in 2:1 multiplexed video switch, which has the advantage of using analog technology to accurately convert standard and high definition video signals (YPbPr) to computer video ( RGB) format. The LMH1251 decoder chip enhances compatibility between different video standards and formats, allowing consumers to directly play video signals from DVD players, video game consoles and other electronic products using a PC monitor.The LMH1251 chip also performs all the necessary synchronization functions to generate the horizontal and vertical sync signals required for standard and high definition video formats.
The LMH1251 chip uses analog technology to convert the signal. Since the whole conversion process is performed by a color/space conversion matrix, there is no need to go through multiple conversion steps like digital technology. The advantage is that the decoded image is clearer and brighter than the adoption. Other solutions for discrete components, digital products or FPGAs are even better.
Discrete solutions often require up to 20 components. The disadvantage is that they take up more board space, consume more power, and the decoding is not ideal, and engineers must have a deep understanding of this design. understanding. Digital solutions and FPGAs are expensive and generally have many features that are not necessarily required by the system. The analog design of the LMH1251 chip helps reduce unwanted features and is extremely compact and easy to fit into the system.
National's LMH1251 chip converts video signals based on vector range analysis with an error of no more than ±1%, which is higher than existing solutions on the market. The chip can support a set of YPbPr input signals and a set of RGB/HSync/VSync input signals, and the output can use the built-in 2:1 multiplexer to output the decoded TV signal or based on the selected input signal. Buffered PC video signals. The LMH1251 chip has an RGB path with a bandwidth of up to 400MHz, so it can support UXGA video signal resolution up to 1600 x 1200. In addition, the output of this chip can display the original RGB video signal.
The YPbPr video signal path with a bandwidth of 70MHz is equipped with an intelligent video signal detection circuit that automatically senses video formats such as 480i, 480p, 720p, 1080i, and 1080p, and converts them using the associated color/space matrix for output in RGBHV format. Video signal. The LMH1251 chip saves printed circuit boards by eliminating the need for a microcontroller to select the appropriate sense line and adding all the necessary components such as a synchronous processor, 2:1 multiplexer, and analog color/space conversion matrix. Board space.
The LMH1251 is available in a TSSOP-24 package and is priced at $3.49 each in 1,000-unit quantities. The chip is also available in a lead-free package.
Digital Display Repeater Co., Ltd. , http://www.nsselectronic.com