Multi-format video sync separator


Product details


Iq (Typ) (uA) 9500 Rating Catalog Operating temperature range (C) -40 to 85 Supply voltage (Max) (V) 5 Supply voltage (Min) (V) 3.3 open-in-new Find other Real-time clocks (RTCs) & timers

Package | Pins | Size

TSSOP (PW) 14 32 mm² 5 x 6.4 open-in-new Find other Real-time clocks (RTCs) & timers


  • 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

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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.

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LMH1980 ACTIVE Auto-detecting SD/HD/PC video sync separator This product outputs a different video format detection output

Technical documentation

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Type Title 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) Apr. 05, 2017
Application note Migrating From the LM1881 to the LMH1980 (Rev. A) May 03, 2013
User guide AN-1599 LMH1981 Evaluation Board Instruction Manual (Rev. C) Apr. 26, 2013
User guide AN-1841 LMH1982 Evaluation Board User Guide (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 Triple Rate SDI IP FPGA Resource Utilization on SDXILEVK/AES-EXP-SDI-G Ref Dsgn (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. 02, 2007
User guide Broadcast Video Owner's Manual Nov. 17, 2006
White paper Improving Video Clock Generation in Modern Broadcast Video Systems Jul. 01, 2006

Design & development

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Hardware development

document-generic User guide

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.

Design tools & simulation

SNLM154B.ZIP (51 KB) - IBIS Model
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PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Reference designs

Video Sync and Video Clock Generation and Distribution Reference Design
TIDA-00424 A video clock sub-system designed to perform video sync separation and derives synchronous video clocks for video and audio sub-systems.
document-generic Schematic document-generic User guide

CAD/CAE symbols

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