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LMH1980

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Auto-detecting SD/HD/PC video sync separator

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Data sheet

LMH1980

ACTIVE
Data sheet Order now

Product details

Number of outputs 5 Output type CMOS Core supply voltage (V) 3.3, 5 Output supply voltage (V) 3.3, 5 Input type CMOS Operating temperature range (°C) -40 to 85 Features Video sync separator Rating Catalog
Number of outputs 5 Output type CMOS Core supply voltage (V) 3.3, 5 Output supply voltage (V) 3.3, 5 Input type CMOS Operating temperature range (°C) -40 to 85 Features Video sync separator Rating Catalog
VSSOP (DGS) 10 14.7 mm² (3 mm × 4.9 mm)
  • 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

All trademarks are the property of their respective owners.

  • 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

All trademarks are the property of their respective owners.

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.

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.
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* Data sheet LMH1980 Auto-Detecting SD/HD/PC Video Sync Separator datasheet (Rev. A) Mar 15, 2013
Application note LMH1980 Sync Separator Design Considerations in Cable Hot-Plug Applicatio Mar 27, 2016
Application note Migrating From the LM1881 to the LMH1980 (Rev. A) May 3, 2013

Design & development

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Evaluation board

LMH1980MMEVAL — Evaluation Board for LMH1980

The LMH1980 Evaluation Board can be used to test the LMH1980 Auto-Detecting SD/HD/PC Video Sync Separator and as a reference for PCB layout design.

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