The input accepts standard analog video signals with either bi-level or tri-level sync, and the outputs provide all of the critical timing signals in CMOS logic, including composite, horizontal, and vertical syncs, burst/back porch timing, odd/ even field, and video format outputs. The horizontal sync output features very low jitter, minimizing external circuitry needed to clean and reduce jitter in subsequent sync processing stages. The LMH1981 automatically detects the input video format, eliminating the need for programming using a microcontroller or external RSET resistor. The sync separator applies precise 50% sync slicing to ensure accurate sync extraction for inputs with irregular amplitude, offset, and noise conditions. Its unique video format feature (pin 9) outputs the total vertical scan lines per frame as an 11-bit binary serial bit 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 the full commercial temperature range. |