LMH1980 Auto-Detecting SD/HD/PC Video Sync Separator | TI.com


Auto-Detecting SD/HD/PC Video Sync Separator



The LMH1980 is an auto-detecting SD/HD/PC video sync separator ideal for use in a wide range of video applications, such as automotive LCD monitors, video capture & editing devices, surveillance & security equipment, and machine vision and inspection systems.

The LMH1980 accepts an analog video input signal with either bi-level or tri-level sync and automatically detects the video format, eliminating the need for external RSET resistor adjustment required by other sync separators (e.g.: LM1881). The outputs provide timing signals in CMOS logic, including Composite, Horizontal, and Vertical Syncs, Burst/Back Porch Timing, and Odd/Even Field outputs. The HD flag output (pin 5) provides a logic low signal only when a valid HD video input with tri-level sync is detected. The HD flag can be used to disable an external switch-controlled SD chroma filter when HD video is detected, or enable it when SD video is detected. For non-standard video with bi-level sync and without vertical serration pulses, a default vertical sync pulse will be output and no horizontal sync pulses will be output during the vertical sync interval.

The LMH1980 is available in a space-saving 10-lead Mini-SO Package (VSSOP) and operates over a temperature range of −40°C to +85°C.


  • Analog Video Sync Separation for NTSC, PAL, 480I/P, 576I/P, 720P, 1080I/P/PsF, and Many VESA-Compatible Timing Formats
  • Composite Video (CVBS), S-Video (Y/C), and Component Video (YPBPR/GBR) and PC Graphics (RGsB) Interfaces
  • SD/PC Bi-Level Sync & HD Tri-Level Sync Compatible
  • Composite, Horizontal, and Vertical Sync Outputs
  • Burst/Back Porch Timing, Odd/Even Field, and HD Detect Flag outputs
  • Automatic Video Format Detection
  • Fixed-Level Sync Slicing for Video Inputs from 0.5 to 2 VPP
  • 3.3V to 5V Supply Operation

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