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ML6426-5 Datasheet(PDF) 7 Page - Fairchild Semiconductor |
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ML6426-5 Datasheet(HTML) 7 Page - Fairchild Semiconductor |
7 / 17 page DATA SHEET ML6426 REV. 3A August 2004 7 Typical Applications Reconstruction filter selection for HDTV and VGA signal filtering The filtering requirements for HDTV and VGA standards vary depending on the resolution of the image to be dis- played, and its refresh rate. The actual refresh rate of the dis- play is not necessarily the same as the transmission rate of the frames of images. Some formats use a frame rate of 30Hz, but the display of those formats cannot be scanned onto the CRT at 30Hz. Excessive large area flicker would result. Such kinds of flicker can be seen on a PAL display with its brightness set high. To avoid this, the video will need to be stored in a frame buffer. This buffer already exists in the MPEG decoder of HDTV systems, so there is no cost penalty. The buffer is read out at twice the rate as the frame rate for 30Hz systems, thus getting us a refresh rate of 60Hz. Similar things are done for the 24Hz frame rate formats to boost them to a 60Hz refresh rate. Table 1. HDTV / Advanced TV Applications: (From Table 10.3 from ATSC document A54) P=progressive scan, I=interlaced scan Table 2. Choosing the Correct Reconstruction Filter and Video Amplifier for TV Applications, ML6426 options P=progressive scan, I=interlaced scan, na = not available Notes 1. NTSC display rates, can be fed directly into NTSC encoder (set top box) 2. 60 Hz also includes 59.94Hz 3. Custom frequencies ranging ± 3 to 6MHz can be special cut to order Pixels Vertical Lines Aspect Ratio Picture Transmission Rate 1920 1080 16:9 60I, 30P, 24P 1280 720 16:9 60P, 30P, 24P 704 480 16:9 and 4:3 60P, 60I, 30P, 24P 640 480 4:3 60P, 60I, 30P, 24P 1920 1080 30P, 24P 60Hz 70.6KHz 162MHz 81MHz N/A SMPTE 1280 720 60P, 30P, 24P 60Hz 47.1KHz 60MHz 30MHz ML6426-5 ML6426-4 704 480 (Note 1) 60I 60Hz 15.7KHz 13.5MHz 6.75MHz ML6426-1 704 480 60P, 30P, 24P 60Hz 31KHz 27MHz 13.5MHz ML6426-2 ML6426-4 640 480 (Note 1) 60I 60Hz 15.7KHz 24.5MHz 12MHz ML6426-2 640 480 60P, 30P, 24P 60Hz 31KHz 12.27MHz 6MHz ML6426-1 |
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