GS2970 Datasheet, PDF (4/145 Pages) Semtech Corporation – 3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing

Contents
Key Features ........................................................................................................................................................1
Errata...................................................................................................................................................................... 1
Applications ......................................................................................................................................................... 1
Description ........................................................................................................................................................... 2
Functional Block Diagram ..............................................................................................................................3
Revision History .................................................................................................................................................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 ............................................................................................................................... 25
4. Detailed Description.................................................................................................................................. 28
4.1 Functional Overview .................................................................................................................... 28
4.2 SMPTE 425M Mapping - 3G Level A and Level B Formats ............................................... 28
4.2.1 Level A Mapping................................................................................................................ 28
4.2.2 Level B Mapping ................................................................................................................ 29
4.3 Serial Digital Input ........................................................................................................................ 29
4.4 Serial Digital Loop-Through Output ........................................................................................ 29
4.5 Serial Digital Reclocker ............................................................................................................... 30
4.5.1 PLL Loop Bandwidth ........................................................................................................ 30
4.6 External Crystal/Reference Clock ........................................................................................... 31
4.7 Lock Detect ...................................................................................................................................... 33
4.7.1 Asynchronous Lock .......................................................................................................... 33
4.7.2 Signal Interruption............................................................................................................ 34
4.8 SMPTE Functionality .................................................................................................................... 34
4.8.1 Descrambling and Word Alignment ........................................................................... 34
4.9 Parallel Data Outputs ................................................................................................................... 34
4.9.1 Parallel Data Bus Buffers................................................................................................. 34
4.9.2 Parallel Output in SMPTE Mode ................................................................................... 38
4.9.3 Parallel Output in DVB-ASI Mode ............................................................................... 38
4.9.4 Parallel Output in Data-Through Mode ..................................................................... 39
4.9.5 Parallel Output Clock (PCLK)......................................................................................... 39
4.9.6 DDR Parallel Clock Timing ............................................................................................. 40
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 ....................................................................................... 48
4.13 Automatic Video Standards Detection ................................................................................ 56
4.14 Data Format Detection & Indication ..................................................................................... 59
GS2970 3Gb/s, HD, SD SDI Receiver Complete with
SMPTE Audio and Video Processing
Data Sheet
47478 - 4
September 2012
4 of 145