ADV7177 Analog Devices, ADV7177 Datasheet - Page 36

• Manufacturer Part Number: ADV7177
• Description: Integrated Digital CCIR-601 to PAL/NTSC Video Encoder
• Manufacturer: Analog Devices

ADV7177/ADV7178
If an output filter is required for the CVBS, Y, UV, Chroma and
RGB outputs of the ADV7177/ADV7178, the following filter in
Figure 63 can be used. Plots of the filter characteristics are
shown in Figures 64, 65 and 66. An output filter is not required
if the outputs of the ADV7177/ADV7178 are connected to an
analog monitor or an analog TV; however, if the output signals
are applied to a system where sampling is used (e.g., digital
TV), a filter is required to prevent aliasing.
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
–70
IN
–5
0
10k
V
dB
R
75
– OP
1 H
L
Figure 64. Output Filter Plot
Figure 63. Output Filter
100k
C
470pF
2.7 H
L
FREQUENCY – Hz
C
330pF
1M
0.68 H
L
C
56pF
10M
R
75
OPTIONAL OUTPUT FILTER
OUT
100M
APPENDIX 5
–36–
–10
–15
–20
–25
–30
–35
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–4.5
–5
0.0
0
1
1
Figure 66. Output Filter Plot Close Up
V
V
Figure 65. Output Filter Close Up
dB
dB
– OP
– OP
2
FREQUENCY – MHz
FREQUENCY – MHz
10
4
6
8
100
10
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