The LMH1981 is a high performance multi-format sync separator ideal for use in a wide
range of video applications, such as broadcast and professional video equipment and HDTV/DTV
The input accepts standard analog SD/ED/HD video signals with either bi-level or
tri-level sync, and the outputs provide all of the critical timing signals in CMOS logic, which
swing from rail-to-rail (VCC and GND) including Composite, Horizontal, and
Vertical Syncs, Burst/Back Porch Timing, Odd/Even Field, and Video Format Outputs. HSync features
very low jitter on its leading (falling) edge, minimizing external circuitry needed to clean and
reduce jitter in subsequent clock generation stages.
The LMH1981 automatically detects the input video format, eliminating the need for
programming using a microcontroller, and applies precise 50% sync slicing to ensure accurate sync
extraction at OH, even for inputs with irregular amplitude from improper
termination or transmission loss. Its unique Video Format Output conveys the total horizontal line
count per field as an 11-bit binary serial data stream, which can be decoded by the video system to
determine the input video format and enable dynamic adjustment of system parameters, i.e.: color
space or scaler conversions. The LMH1981 is available in a 14-pin TSSOP package and operates over a
temperature range of −40°C to +85°C.