LMH1981 Multi-Format Video Sync Separator | TI.com


Multi-Format Video Sync Separator

Multi-Format Video Sync Separator - LMH1981


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.


  • 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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Parametrics Compare all products in SDI video timing

Power consumption (mW)
Supply Voltage (V)
Control interface
Formats supported
Operating temperature range (C)
Package Group
Package size: mm2:W x L (PKG)
LMH1981 LMH1980
Sync separator     Sync separator    
30     35    
3.3 to 5    
3.3 to 5    
Pin     Pin    
SD bi-level and HD tri-level sync
SD/PC bi-level and HD tri-level
PC Sync on Green (VESA)
-40 to 85     -40 to 85    
TSSOP | 14     VSSOP | 10    
14TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 14)     10VSSOP: 9 mm2: 3 x 3 (VSSOP | 10)