參數(shù)資料
型號(hào)： ADV7312
廠商： Analog Devices, Inc.
英文描述： Multiformat 11-Bit HDTV Video Encoder
中文描述： 多格式11位高清晰度電視視頻編碼器
文件頁數(shù)： 55/84頁
文件大小： 975K
代理商： ADV7312
REV. 0
ADV7312
–55–
BOARD DESIGN AND LAYOUT CONSIDERATIONS
DAC Termination and Layout Considerations
The ADV7312 contain an on-board voltage reference. The
ADV7312 can be used with an external V
REF
(AD1580).
The R
SET
resistors are connected between the R
SET
pins and
AGND and are used to control the full-scale output current and
therefore the DAC voltage output levels. For full-scale output,
R
SET
must have a value of 3040
. The R
SET
values should not
be changed. R
LOAD
has a value of 300
for full-scale output.
Video Output Buffer and Optional Output Filter
Output buffering on all six DACs is necessary in order to drive
output devices, such as SD or HD monitors. Analog Devices
produces a range of suitable op amps for this application, for
example the AD8061. More information on line driver buffering
circuits is given in the relevant op amps’ data sheets.
An optional analog reconstruction low-pass filter (LPF) may be
required as an anti-imaging filter if the ADV7312 is connected
to a device that requires this filtering.
The filter specifications vary with the application.
Table XVI. External Filter Requirements
Cutoff
Frequency Attenuation
(MHz)
Application
Oversampling
2
×
16
×
1
×
8
×
1
×
2
×
–50 dB @ (MHz)
SD
SD
PS
PS
HDTV
HDTV
>6.5
>6.5
>12.5
>12.5
>30
>30
20.5
209.5
14.5
203.5
44.25
118.5
560
600
3
4
1
22pF
600
DAC
OUTPUT
75
BNC
OUTPUT
10 H
560
Figure 54. Example of Output Filter for SD,
16
×
Oversampling
0
–80
–70
–60
–50
–40
–30
–20
–10
0
–30
–60
–90
–120
–150
–180
–210
–240
1G
1M
10M
100M
FREQUENCY (Hz)
CIRCUIT FREQUENCY RESPONSE
GROUP DELAY (sec)
PHASE (Deg)
MAGNITUDE (dB)
21n
18n
15n
12n
9n
6n
3n
0
24n
G
Figure 55. Filter Plot for Output Filter for SD,
16
×
Oversampling
相關(guān)PDF資料
PDF描述
ADV7312KST Multiformat 11-Bit HDTV Video Encoder
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADV7312KST 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat 11-Bit HDTV Video Encoder
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ADV7314KST 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat 216 MHz Video Encoder with Six NSV 14-Bit DACs
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ADV73186703 制造商:LG Corporation 功能描述:FRAME ASSEMBLY,DOOR
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