ML6426-1 FAIRCHILD [Fairchild Semiconductor], ML6426-1 Datasheet - Page 8

• Manufacturer Part Number: ML6426-1
• Description: High Bandwidth Triple Video Filters with Buffered Outputs for RGB or YUV
• Manufacturer: FAIRCHILD [Fairchild Semiconductor]

ML6426
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 sum-
marized 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 reso-
lutions for legacy video, SDTV, and HDTV.
Table 3. Choosing the Correct Reconstruction Filter and Video Amplifier for TV Applications, ML6426 options
N/A = not available
8
1024
1280
1600
640
800
1024
1200
480
600
768
UXGA
SVGA
SVGA
SVGA
SVGA
SXGA
SXGA
XGA
XGA
XGA
VGA
VGA
VGA
Interlaced
60Hz
72Hz
75Hz
56Hz
60Hz
72Hz
75Hz
43Hz
60Hz
70Hz
75Hz
60Hz
60Hz
31.5kHz
37.9kHz
37.5kHz
35.1kHz
37.9kHz
48.1kHz
46.9kHz
35.5kHz
37.9kHz
56.5kHz
80kHz
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 individu-
ally 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. Fairchild’s 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 migra-
tion to integrate newer resolutions to filter and drive various
DAC outputs at different sampling frequencies.
25.175MHz
31.5MHz
31.5MHz
49.5MHz
44.9MHz
135MHz
113MHz
166MHz
36MHz
40MHz
50MHz
65MHz
75MHz
12.5MHz
15.5MHz
15.5MHz
37.5MHz
18MHz
20MHz
25MHz
25MHz
23MHz
33MHz
68MHz
57MHz
83MHz
REV. 3A August 2004
ML6426-2
ML6426-3
ML6426-3
ML6426-3
ML6426-3
ML6426-3
ML6426-3
ML6426-3
ML6426-5
ML6426-5
DATA SHEET
na
na
na