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
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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