參數(shù)資料
型號: ADV7178
廠商: Analog Devices, Inc.
英文描述: Integrated Digital CCIR-601 to PAL/NTSC Video Encoder
中文描述: 綜合數(shù)字無線電咨詢委員會,601到PAL / NTSC制式視頻編碼器
文件頁數(shù): 36/38頁
文件大?。?/td> 280K
代理商: ADV7178
ADV7177/ADV7178
–36–
REV. 0
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.
L
1
m
H
L
2.7
m
H
L
0.68
m
H
R
75
V
R
75
V
C
470pF
C
330pF
C
56pF
IN
OUT
Figure 63. Output Filter
FREQUENCY – Hz
10k
100M
100k
D
1M
10M
0
–5
–10
–70
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
V
dB
– OP
Figure 64. Output Filter Plot
APPENDIX 5
OPTIONAL OUTPUT FILTER
FREQUENCY – MHz
1
100
D
10
0
–35
–5
–10
–15
–20
–25
–30
V
dB
– OP
Figure 65. Output Filter Close Up
FREQUENCY – MHz
1
10
D
2
0.0
–3.5
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
V
dB
– OP
4
6
8
–4.5
–4.0
Figure 66. Output Filter Plot Close Up
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