LMH1251 is a wideband 2:1 analog video switch with an integrated YPBPR to RGB decoder
The LMH1251 is a wideband 2:1 analog video switch featuring an integrated YP BPR to RGB decoder. It accepts one set of YP BPR inputs and one set of RGB/HSYNC/VSYNC inputs, outputting either a decoded TV signal or a buffered PC video signal based on the selected input.
The device includes a SYNC separator and processor capable of extracting timing information from both Standard Definition Television (SDTV) and High Definition Television (HDTV) sources. It provides bi-level and tri-level sync separation. The color space conversion utilizes a high-precision fully analog dematrixer with chrominance accuracy less than 2.5% amplitude error and 1.5° phase error.
| YP BPR path bandwidth (−3 dB) | 70 MHz, 700 mV PP |
|---|---|
| RGB path bandwidth (−3 dB) | 400 MHz, 700 mV PP |
| Supply Voltage (VCC) | 4.75V to 5.25V |
| Operating Temperature Range | 0°C to +70°C |
| Chrominance Amplitude Error | < 2.5% |
The device supports SDTV, HDTV, XGA, SXGA, and UXGA video formats.
It uses a smart video detection circuit to automatically sense SDTV and HDTV formats.