National Semiconductor Audio / Video Clock Generator Applications Without Additi
National Semiconductor Corporation (National Semiconductor Corporation) (U.S. NYSE: NSM) today introduced an application for professional and broadcast video equipment, a new three-speed (3G/HD/SD) Audio / Video Clock Generator in the application of such video device eliminates the need for an external clock to adjust. This model for the LMH1983 clock generator chip for a variety of different applications with the necessary video and audio reference clock. In addition, highly integrated chips which meet the industry’s lowest output jitter of only 40ps (peak to peak), so as long as the FPGA using a serial / deserializer can be reached in the application of Film and Television Engineers (SMPTE) standards.
By LMH1983 can replace the three external chip phase-locked loop (PLL), voltage controlled crystal oscillator (VCXO) and loop filter. Simplify system design, saving material costs and the board. LMH1983 chip features can produce four simultaneous low-voltage differential signaling (LVDS) clock, the system provides a dedicated time frame the first pulse, while only very few parameters set for the FPGA is a “plug and play” solution. LMH1983 chip phase-locked loop using the fine-tuning can save time, thus speeding up the market process, in which more than discrete video / audio clock generator program better. LMH1983 chip supports SMPTE serial digital interface (SDI) video standards and AES3/EBU digital audio standard, these are 1080p high definition (HD) cameras and video capture, conversion, processing, editing and distribution of equipment commonly used standards.
To video processing and format converter plug-in example, LMH1983 clock generator can be at the same time a new generation of FPGA chips to provide the SMPTE 424M system clock (148.5MHz and 148.5/1.001MHz). General studio video equipment must be “Sync Lock” and LMH1983 chip, these devices can be synchronized high-frequency clock, while the number of pixel clock rate of the reference video signal in accordance with the horizontal and vertical timing signal phase be locked. As part of the video needs of embedded audio signals or audio signals from which removed, LMH1983 chip for such applications can be locked to video reference signals synchronized audio and video clocks.
The LMH1983 can generate audio clocks video clock generator – Main features
LMH1983 chip two phase-locked loop architecture, built-in 4 and 3 voltage-controlled oscillator phase-locked loop, all integrated in 40-pin LLP package within. The chip can use a variety of compatible reference signal, such as National Semiconductor LMH1981 video sync separator output of the horizontal / vertical sync signals, streaming from the SDI signal or 27MHz clock source, resulting in simultaneous standard-definition (SD) video, high-definition video (twice as) and three kinds of audio clock. LMH1983 chip, there are many other features such as automatic input format detection, to prevent loss of digital frequency reference signal preservation techniques, simple set of different audio / video output format, and synchronization lock or access digital free-run mode.
LMH1983 chips can identify the major video standards HVF sync signal and 27MHz, 10MHz and 32/44.1/48/96kHz other audio word clock. In addition, this chip is also compatible with I2C bus interface for setting up chip-chip registers and read the state parameters. LMH1983 chip 3.3V Power | Regulator supply, energy efficiency high. In addition, the built-in PLL can be independent of each on / off to save power consumption of the system.
Price and Availability
LMH1983 chip has begun volume production, purchasing 1,000-unit price of 16 U.S. dollars per teeth. For further information or to order samples and an evaluation board, visit http://www.national.com/pf/LM/LMH1983.html website.
National Semiconductor’s online photo reference room with this product, high-resolution photos for download, the Photographic Library of the site at http://www.national.com/analog/pressroom/interface.
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