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TVP5040 Datasheet(PDF) 20 Page - Texas Instruments

Part No. TVP5040
Description  NTSC/PAL Digital Video Decoder With Macrovision Detection
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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 20 page
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2–4
2.2.1
Digital Input Selection
The digital processing block takes digitized composite or S-video from the two internal A/D converters running at 2x
PCLK rate. The data from the A/D converters are appropriately multiplexed as shown in Figure 2–3 for downstream
separation and processing of luma and chroma.
A/D CH1
Luma
Composite
Decimation
Filter
M
u
x
Chroma
Decimation
Filter
M
u
x
A/D CH2
Input Multiplexer
Figure 2–3. Digital Input Multiplexer
2.2.2
Decimation Filter
Digitized composite or S-video at 2x PCLK rate first passes through two decimation filters that reduce the data rate
from 2x to 1x PCLK. The decimation filter is a half-band filter whose frequency response is shown in Figure 2–4. For
applications that can not tolerate high frequency roll off, the decimation filters can be bypassed via host port. The 2x
oversampling and decimation filtering can effectively increase the overall signal-to-noise ratio by 3 dB. This
advantage is lost if the decimation filter is bypassed.
f – Frequency – MHz
–60
–50
–40
–30
–20
–10
0
10
012
345
678
PAL SQP –3 dB at 6.66 MHz
CCIR 601 –3 dB at 6.10 MHz
NTSC SQP –3 dB at 5.54 MHz
Figure 2–4. Decimation Filter Frequency Response




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