1FEATURES
2• 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 V PP
• 3.3V to 5V Supply Operation

APPLICATIONS
• Consumer, Professional, Automotive &
Industrial Video
• Video Capture, Editing, and Processing
• Genlock Circuits
• Surveillance & Security Video Systems
• Set-Top Boxes (STB) & Digital Video
Recorders (DVR)
• LCD / Plasma Displays and Video Projectors
• Machine Vision and Inspection Systems
• Video Trigger Oscilloscopes and Waveform
Monitors

DESCRIPTION
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.