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. It automatically detects the video format, eliminating the need for external RSET resistor adjustment required by other sync separators. 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 provides a logic low signal only when a valid HD video input with tri-level sync is detected. It 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-ld. Mini-SO Package (MSOP) and operates over a temperature range of −40°C to +85°C.
The LMH1980 auto‑detects SD, HD and PC video formats and separates sync signals for NTSC, PAL, 480I/P, 576I/P, 720P, 1080I/P/PsF and many VESA‑compatible timings. It outputs CMOS logic signals such as Composite, Horizontal, Vertical, Burst/Back Porch, Odd/Even Field and an HD‑detect flag, making it suitable for automotive LCD monitors, video capture devices, surveillance equipment, and machine‑vision systems.
The device is offered in a space‑saving 10‑lead MSOP package and operates from –40 °C to +85 °C with a supply voltage of 3.3 V to 5.5 V. Pin 5 provides a low‑level HD flag when HD video is detected. Detailed pin descriptions, absolute‑maximum ratings, electrical characteristics, and timing diagrams are provided in the document.
| Operating Temperature Range | -40 °C to +85 °C |
|---|---|
| Supply Voltage | 3.3 V to 5.5 V |
| HD Detect Flag Output | Logic low when HD video detected |
It supports NTSC, PAL, 480I/P, 576I/P, 720P, 1080I/P/PsF and many VESA‑compatible timing formats.
The device operates from 3.3 V up to 5.5 V.
It provides Composite, Horizontal, Vertical sync, Burst/Back Porch, Odd/Even Field, and an HD‑detect flag output.