Datasheet

TVP5151
www.ti.com SLES241E–SEPTEMBER 2009– REVISED OCTOBER 2011
Figure 3-2. Chrominance Trap Filter Frequency Figure 3-3. Chrominance Trap Filter Frequency
Response, NTSC ITU-R BT.601 Sampling Response, PAL ITU-R BT.601 Sampling
3.4 Color Low-Pass Filter
In some applications, it is desirable to limit the Cb/Cr bandwidth to avoid crosstalk. This is especially true
in case of video signals that have asymmetrical Cb/Cr sidebands. The color LP filters provided limit the
bandwidth of the Cb/Cr signals.
Color LP filters are needed when the comb filtering turns off, due to extreme color transitions in the input
image. See Section 3.21.25, Chrominance Control #2 Register, for the response of these filters. The filters
have three options that allow three different frequency responses based on the color frequency
characteristics of the input video as shown in Figure 3-4.
Figure 3-4. Color Low-Pass Filter with Filter Characteristics, NTSC/PAL ITU-R BT.601 Sampling
Copyright © 2009–2011, Texas Instruments Incorporated Functional Description 11
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