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參數資料
| 型號： | ADV7172KST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 顏色信號轉換 |
| 英文描述： | Digital PAL/NTSC Video Encoder with Six DACs 10 Bits, Color Control and Enhanced Power Management |
| 中文描述： | COLOR SIGNAL ENCODER, PQFP48 |
| 封裝： | PLASTIC, TQFP-48 |
| 文件頁數： | 51/59頁 |
| 文件大小： | 455K |
| 代理商： | ADV7172KST |
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ADV7172/ADV7173
–51–
REV. A
If an output filter is required for the CVBS, Y, UV, Chroma
and RGB outputs of the ADV7172/ADV7173, the filter shown
below can be used. The plot of the filter characteristics is
shown in Figure 93. An Output Filter is not required if the
outputs of the ADV7172/ADV7173 are connected to most
analog monitors or analog TVs; however, if the output signals
are applied to a system where sampling is used (e.g., Digital
TVs), then a filter is required to prevent aliasing.
APPENDIX 7
OPTIONAL OUTPUT FILTER
2.2
m
H
22pF
270pF
330pF
FILTER I/P
FILTER O/P
Figure 92. Output Filter Used with Output Buffer
FREQUENCY – Hz
10k
100M
100k
1M
10M
D
0
–5
–10
–70
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
V
dB
– OP
Figure 93. Output Filter Plot
APPENDIX 8
OPTIONAL DAC BUFFERING
When external buffering is needed of the ADV7172/ADV7173
DAC outputs, the configuration in Figure 94 is recommended.
This configuration shows the DAC outputs, A, B, C, running at
half (18 mA) their full current (36 mA) capability. This will
allow the ADV7172/ADV7173 to dissipate less power; the analog
current is reduced by 50% with a R
SET1
= 300
and R
SET2
=
600
and an R
LOAD
of 75
. This mode is recommended for
3.3 V operation as optimum performance is obtained from the
DAC outputs at 18 mA with a V
AA
of 3.3 V. This buffer also
adds extra isolation on the video outputs (see buffer circuit in
Figure 95). Note that DACs D, E and F will always require
buffering as the full-scale output current from these DACs is
limited to 8.66 mA. With DACs A, B and C, buffering is op-
tional, based on the user requirements for performance and power
consumption.
When calculating absolute output full-scale current and voltage,
use the following equations:
V
OUT
=
I
OUT
×
R
LOAD
(
I
OUT
=
V
REF
×
K
)
R
SET
K
=
4.2146 constant,
V
REF
=
1.235 V
ADV7172/ADV7173
V
REF
PIXEL
PORT
V
AA
OUTPUT
BUFFER
DAC A
CVBS
CHROMA
G
LUMA
B
R
300
V
R
SET1
OUTPUT
BUFFER
DAC B
OUTPUT
BUFFER
DAC C
OUTPUT
BUFFER
DAC D
OUTPUT
BUFFER
DAC E
OUTPUT
BUFFER
DAC F
DIGITAL
CORE
600
V
R
SET2
Figure 94. Output DAC Buffering Configuration
300
V
75
V
OUTPUT TO
OUTPUT FILTER/
TV MONITOR
1k
V
INPUT
+V
CC
AD847
–V
CC
1k
V
Figure 95. Recommended Output DAC Buffer
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADV7172KST-REEL | 制造商:Analog Devices 功能描述: |
| ADV7172KSTZ | 制造商:Analog Devices 功能描述: |
| ADV7172KSTZ-REEL | 功能描述:IC DAC VIDEO NTSC 6-CH 48-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統 電壓 - 電源，模擬:- 電壓 - 電源，數字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| ADV7173 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Digital PAL/NTSC Video Encoder with Six DACs 10 Bits, Color Control and Enhanced Power Management |
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