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.