National Semiconductor Corporation ("National Semiconductor") announced a number of different formats supported video sync separator, which is characterized by jitter than competitive products on the market less suitable for high-definition broadcast equipment and AT28C16E-15SI datasheet and professional level video system. Video system design engineers use this model as long as the separation of the LMH1981 chip, will not need the addition of filter-class level and to eliminate jitter, but also can accurately extract horizontal and vertical sync signals. LMH1981 chip sync signal can be separated in order to generate consistent with NTSC, PAL, SECAM, standard definition and high-definition video signal formats (including 480i, 480p, 576i, 576p, 720p, 1080i and 1080p), low-jitter level and field synchronization signal. The chip can be for any video system, including horizontal, vertical and composite signal synchronization system to provide the necessary timing output, while other features include the odd / even field, burst / back porch clamp and a patented automatic video signal format detection. In addition, the chip can also receive bi-and tri-level sync video inputs, but also has a limit of 50% of the double value of the wave function, to ensure accurate separation of different amplitude, offset and noise of the signal. LMH1981 chip can accept a composite video signal (CVBS), S video signal (Y / C), component video (YPbPr) and video signals from a computer interface. The chip can automatically detect the input signal format, so no need to use micro-controller to be set outside the system, but also the use of appropriate limit value of 50% of synchronous dual-wave technology. In addition, this chip also features automatic video format detection feature, so you can 11-bit binary data stream output of the total vertical resolution or line count. Only accept the specified output pin provides the input video signal format, and once found any change in format, will directly inform the video system so that the system can be flexibly adjusted color space or scalar conversion parameters. According to reports, the chips were subject to high-definition input video signal input reference jitter test results show that the output horizontal sync jitter than the other programs currently on the market by 30%. This improvement for the system design engineers more freedom, so that they can use a more compact and flexible FPGA, and the reduction must be used to eliminate jitter and external components. Many systems have been isolated in sync after the set number of filtering levels plus or FPGA, in order to remove and filter jitter before the sync pulse input phase locked loop. LMH1981 chip has the advantage of eliminating the desired external circuit to minimize jitter, so that vendors can develop systems for the new House and provide a more accurate reference clock. The chip can operate only a single power supply, power supply voltage range between 3.3V and 5V, and can be used with VHS and DVD and other video systems commonly used in film and television production Macrovision copyright protection system (MVCPS) compatible. LMH1981 chip TSSOP-14 package, is in 1,000-unit quantities price of $ 3.79, quantities.