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ML6426CS-15 Datasheet(PDF) 8 Page - Micro Linear Corporation |
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ML6426CS-15 Datasheet(HTML) 8 Page - Micro Linear Corporation |
8 / 17 page ML6426 8 November, 1999 TYPICAL APPLICATIONS (Continued) Pixel clock rates for the output D/A converters can be roughly determined from the Table 1. Don’t forget that the deflection system of a CRT display needs retrace time for the vertical and horizontal. This retrace time can vary from one design of an HDTV set to another, as it only involves tradeoffs between the frame buffer in the MPEG decoder and the CRT deflection system. Allowing for 10% retrace time for the vertical and 20% for the horizontal, the appropriate Reconstruction Filter is summarized in Table 2. For VGA or RGB monitors, the following resolutions can use the corresponding Reconstruction Filter and Video Amplifier as shown in Table 3. Figures 4, 5, and 6 show system diagrams when the ML6426 provides a good solution. Figure 7 provides a more detailed description for advanced TV applications using various resolutions for legacy video, SDTV, and HDTV. 640 480 VGA 60Hz 31.5kHz 25.175MHz 12.5MHz ML6426-2 VGA 72Hz 37.9kHz 31.5MHz 15.5MHz ML6426-3 VGA 75Hz 37.5kHz 31.5MHz 15.5MHz ML6426-3 800 600 SVGA 56Hz 35.1kHz 36MHz 18MHz ML6426-3 SVGA 60Hz 37.9kHz 40MHz 20MHz ML6426-3 SVGA 72Hz 48.1kHz 50MHz 25MHz ML6426-3 SVGA 75Hz 46.9kHz 49.5MHz 25MHz ML6426-3 1024 768 XGA 43Hz 35.5kHz 44.9MHz 23MHz ML6426-3 Interlaced XGA 60Hz 37.9kHz 65MHz 33MHz ML6426-5 XGA 70Hz 56.5kHz 75MHz 37.5MHz ML6426-5 XGA 75Hz 60kHz 78.75MHz 39.4MHz ML6426-6 1280 1024 SXGA 75Hz 80kHz 135MHz 68MHz na SXGA 60Hz 113MHz 57MHz na 1600 1200 UXGA 60Hz 166MHz 83MHz na N/A = not available Table 3: Choosing the Correct Reconstruction Filter and Video Amplifier for TV Applications, ML6426 options USING THE ML6426 IN MULTIPLE RESOLUTIONS Several ML6426 devices can be used in parallel to construct a selectable filter selection block ranging from frequencies between 6.7 MHz to 50MHz. Each ML6426 can be individually controlled via the disable pin. In a parallel configuration, as shown in Figure 3 and 7, several ML6426 devices can be used and selected via general purpose I/O or other logic to perform the proper reconstruction filtering for the resolution of choice. This configuration allows for a minimum of bill of materials and reduces cost. Micro Linears ML6426 EVAL Kit demonstrates multi-resolution designs. Furthermore, since the ML6426 pin-out is identical for all the options, the filters can be interchanged. This allows for ease of product migration to integrate newer resolutions to filter and drive various DAC outputs at different sampling frequencies. |
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