Features Standard analog video sync separation for NTSC, PAL, 480I/P, 576I/P, 720P, and 1080I/P/PsF from Composite Video (CVBS), S-Video (Y/C), and Component Video (YPBPR/GBR) interfaces Bi-level & tri-level sync compatible Composite, Horizontal, and Vertical Sync Outputs Burst/Back Porch Timing, Odd/Even Field, and Video Format Outputs Superior jitter performance on leading edge of HSync Automatic video format detection 50% sync slicing for video inputs from 0.5 VPP to 2 VPP 3.3V to 5V supply operation Description 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. Applications Broadcast and Professional Video Equipment HDTV/DTV Systems Genlock Circuits Video Capture Devices Set-Top Boxes (STB) & Digital Video Recorders (DVR) Video Displays

Also Recommended LMH1980▲ Smaller Form Factor, Consumer Applications

Typical Application *click for larger image	Connection Diagram click for larger image

Parameters / Values	LMH1981	LMH1980
Function	Sync Separator	Sync Separator
Supported Video Formats	SD bi-level and HD tri-level sync, NTSC , 720p , 1080i/p , 576i/p , 480i/p , PAL	NTSC , SECAM , SD/PC bi-level and HD tri-level sync, 720p , 1080i/p , PC Sync on Green (VESA), 576i/p , 480i/p , PAL
Supply Voltage	3.3 Volt	3.3 Volt
OtherSupply Voltage	3.3V to 5V	3.3V to 5V
Temperature Min	-40 deg C	-40 deg C
Temperature Max	85 deg C	85 deg C

Datasheets

Title		Size	Date	Other Language
	LMH1981 Multi-Format Video Sync Separator	1613 Kbytes	11-Jul-07	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1971: Application Note 1971 Triple Rate SDI IP FPGA Resource Utilization on the SDXILEVK/AES-EXP-SDI-G Reference Design	195 Kbytes	6-May-09
	AN-1599: Application Note 1599 LMH1981 Evaluation Board Instruction Manual	503 Kbytes	11-Feb-09	日本語
	AN-1681: Application Note 1681 Design Migration from the LM1881 to the LMH1980	143 Kbytes	2-Aug-07	日本語
	AN-1893: Application Note 1893 Demonstrating SMPTE-Compliant SDI Output Jitter Using the LMH1982 and Virtex-5 GTP Transmitter	2197 Kbytes	3-Oct-08
	AN-1841: Application Note 1841 LMH1982 Evaluation Board User Guide	913 Kbytes	21-May-08	中文

Other Technical Documents

Title		Type	Date
	A 3 Gbps SDI Connectivity Solution Supporting Uncompressed 1080p60 Video	Signal Path Designer	2008-03-18
	Timing is Everything – The Broadcast Video Signal Path	Signal Path Designer	2007-08-02
	Improving Video Clock Generation in Modern Broadcast Video Systems	Technology Edge	2006-07-01
	Broadcast Video Owner's Manual	Design Guide	2006-11-17

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH1981MT/NOPB RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1639 AVNET-EM Worldwide 710 DIGI-KEY Worldwide 83 FARNELL Europe and Asia 109 KEIKONG Asia Pacific 1875 MOUSER Worldwide 58 NEWARK Americas 34 TAYLOR Americas 1639 TECHMOSA Asia Pacific 94	$5.15 each at 1K+ pcs	rail of 94
LMH1981MTX/NOPB RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 4500 DIGI-KEY Worldwide 0 TAYLOR Americas 4500	$5.15 each at 1K+ pcs	reel of 2500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMH1981.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMH1981 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH1981MTEVAL/NOPB	Evaluation Board for the LMH1981 Multi-Format Video Sync Separator	Full production Lead Free (RoHS)	Distributor Region Qty AVNET-EM Worldwide 1 DIGI-KEY Worldwide 4 FARNELL Europe and Asia 1 MOUSER Worldwide 1 NEWARK Americas 1	$99.00 each	1
Description: 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. Contents: LMH1981 Evaluation Bard LMH1981 AN -1599 LMH1981 Datasheet

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
ML571-1982CLK	High-Performance SMPTE Video Clock Module for Xilinx ML571 Serial Digital Video Board	Full production	Distributor Region Qty	$299.00 each	1
National Semiconductor Enables the Xilinx Virtex 5 FPGA to Comply with SMPTE Jitter Requirements The ML571-1982 CLK reference clock module features National Semiconductor`s highly-integrated multi-rate video clock generator. The LMH1982 can generate two simultaneous SD and HD output clocks genlocked to either the recovered H and V syncs from a Xilinx Virtex-5 LXT FPGA or from the outputs of an LMH1981 sync separator. Additionally, the LMH1982 provides an output Top of Frame timing pulse. In the event of a loss of reference, the device can be configured to default to either free run or holdover operation. This reference design provides a proven video clocking solution for FPGAs that complies with stringent SDI jitter requirements, including the stringent SMPTE 424M standard for 3G-SDI. Integration, ease and flexibility of design, are demonstrated by the LMH1982 requiring a few additional components, and only one 27 MHz VCXO. An additional benefit of the LMH1982 is the programmable charge pump current control register for dynamic control of PLL bandwidth. A wide loop bandwidth can be programmed for faster PLL lock time or a narrow loop bandwidth can be programmed for maximum input attenuation. See more details on the Video Timing Solutions page.

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LMH1981MT/NOPB	53.783	TSSOP	14	1	260	Detail	N/A	N/A	NSUZXYTT LMH19 81MT
LMH1981MTX/NOPB	53.783	TSSOP	14	1	260	Detail	N/A	N/A	NSUZXYTT LMH19 81MT

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMH1981.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMH1981 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMH1981MT	CMOS7	0	21301	0	0	1584000	3	449464325
LMH1981MTX	CMOS7	0	21301	0	0	1584000	3	449464325

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMH1981.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMH1981 is located at RoHS Status.

LMH1981 / LMH1982 SDI Clocking Demo Loading video... Configuring the SDALTEVK Triple Rate SDI Reference Design Loading video... Factory Automation Solutions Loading video...

LMH1981 / LMH1982 SDI Clocking Demo Date: 2009-07-02 Length: 0:02:07 Configuring the SDALTEVK Triple Rate SDI Reference Design Date: 2009-12-18 Length: 0:21:19 Factory Automation Solutions Date: 2009-08-05 Length: 0:05:17