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GS2970A Datasheet(PDF) 4 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 4 Page - Semtech Corporation |
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4 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 4 of 150 Contents Key Features........................................................................................................................................................1 Applications.........................................................................................................................................................1 Description...........................................................................................................................................................2 Functional Block Diagram ..............................................................................................................................3 1. Pin Out...............................................................................................................................................................9 1.1 Pin Assignment ..................................................................................................................................9 1.2 Pin Descriptions ................................................................................................................................9 2. Electrical Characteristics ......................................................................................................................... 16 2.1 Absolute Maximum Ratings ....................................................................................................... 16 2.2 Recommended Operating Conditions .................................................................................... 16 2.3 DC Electrical Characteristics ..................................................................................................... 17 2.4 AC Electrical Characteristics ..................................................................................................... 19 3. Input/Output Circuits ............................................................................................................................... 24 4. Detailed Description.................................................................................................................................. 27 4.1 Functional Overview .................................................................................................................... 27 4.2 SMPTE 425M Mapping - 3G Level A and Level B Formats ............................................... 27 4.2.1 Level A Mapping................................................................................................................ 27 4.2.2 Level B Mapping ................................................................................................................ 28 4.3 Serial Digital Input ........................................................................................................................ 28 4.4 Serial Digital Loop-Through Output ........................................................................................ 28 4.5 Serial Digital Reclocker ............................................................................................................... 29 4.5.1 PLL Loop Bandwidth ........................................................................................................29 4.6 External Crystal/Reference Clock ...........................................................................................30 4.7 Lock Detect ...................................................................................................................................... 31 4.7.1 Asynchronous Lock .......................................................................................................... 32 4.7.2 Signal Interruption............................................................................................................ 33 4.8 SMPTE Functionality .................................................................................................................... 33 4.8.1 Descrambling and Word Alignment ........................................................................... 33 4.9 Parallel Data Outputs ................................................................................................................... 33 4.9.1 Parallel Data Bus Buffers.................................................................................................33 4.9.2 Parallel Output in SMPTE Mode ................................................................................... 37 4.9.3 Parallel Output in DVB-ASI Mode ............................................................................... 37 4.9.4 Parallel Output in Data-Through Mode ..................................................................... 38 4.9.5 Parallel Output Clock (PCLK)......................................................................................... 38 4.9.6 DDR Parallel Clock Timing ............................................................................................. 39 4.10 Timing Signal Generator ........................................................................................................... 41 4.10.1 Manual Switch Line Lock Handling.......................................................................... 42 4.10.2 Automatic Switch Line Lock Handling .................................................................... 43 4.10.3 Switch Line Lock Handling During Level B to Level A Conversion ............... 44 4.11 Programmable Multi-function Outputs ............................................................................... 46 4.12 H:V:F Timing Signal Generation ............................................................................................47 4.12.1 CEA-861 Timing Generation ....................................................................................... 49 4.13 Automatic Video Standards Detection ................................................................................ 56 4.13.1 2K Support......................................................................................................................... 60 |
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