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The LMH1981 is a high performance multi-format sync separator ideal for use in a wide range of video applications, such as broadcast and professional video equipment and HDTV/DTV systems.
The input accepts standard analog SD/ED/HD video signals with either bi-level or tri-level sync, and the outputs provide all of the critical timing signals in CMOS logic, which swing from rail-to-rail (VCC and GND) including Composite, Horizontal, and Vertical Syncs, Burst/Back Porch Timing, Odd/Even Field, and Video Format Outputs. HSync features very low jitter on its leading (falling) edge, minimizing external circuitry needed to clean and reduce jitter in subsequent clock generation stages.
The LMH1981 automatically detects the input video format, eliminating the need for programming using a microcontroller, and applies precise 50% sync slicing to ensure accurate sync extraction at OH, even for inputs with irregular amplitude from improper termination or transmission loss. Its unique Video Format Output conveys the total horizontal line count per field as an 11-bit binary serial data stream, which can be decoded by the video system to determine the input video format and enable dynamic adjustment of system parameters, i.e.: color space or scaler conversions. The LMH1981 is available in a 14-pin TSSOP package and operates over a temperature range of −40°C to +85°C.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | LMH1981 Multi-Format Video Sync Separator datasheet (Rev. H) | Mar 15, 2013 | |
| Selection guide | Broadcast and Professional Video Interface Solutions (Rev. E) | PDF | HTML | Apr 5, 2017 | |
| Application note | Migrating From the LM1881 to the LMH1980 (Rev. A) | May 3, 2013 | ||
| Application note | Triple Rate SDI IP FPGA Resource Utilization on SDXILEVK/AES-EXP-SDI-G Ref Dsgn (Rev. A) | Apr 26, 2013 | ||
| Application note | Demonst SMPTE-Compliant SDI Out Jittr Using LMH1982 & Virtx-5 GTP Xmittr (Rev. A) | Apr 26, 2013 | ||
| Application note | A 3 Gbps SDI Connectivity Solution Supporting Uncompressed 1080p60 Video | Mar 18, 2008 | ||
| Application note | Timing is Everything Çô The Broadcast Video Signal Path | Aug 2, 2007 | ||
| Design guide | Broadcast Video Owner's Manual | Nov 17, 2006 | ||
| White paper | Improving Video Clock Generation in Modern Broadcast Video Systems | Jul 1, 2006 |
For additional terms or required resources, click any title below to view the detail page where available.
The LMH1981 Evaluation Board can be used to evaluate the LMH1981 Multi-Format Sync Separator and as a reference for designing the PCB layout. Refer to the LMH1981 datasheet for more information on PCB layout considerations.
A video clock sub-system designed to perform video sync separation and derives synchronous video clocks for video and audio sub-systems.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| TSSOP (PW) | 14 | Ultra Librarian |
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