參數(shù)資料
型號： ADV7314KST
廠商： ANALOG DEVICES INC
元件分類： 顏色信號轉(zhuǎn)換
英文描述： Multiformat 216 MHz Video Encoder with Six NSV 14-Bit DACs
中文描述： COLOR SIGNAL ENCODER, PQFP64
封裝： LEAD FREE, MS-026BCD, LQFP-64
文件頁數(shù)： 56/84頁
文件大小： 1069K
代理商： ADV7314KST
REV. 0
–56–
ADV7314
BOARD DESIGN AND LAYOUT CONSIDERATIONS
DAC Termination and Layout Considerations
The ADV7314 contains an on-board voltage reference. The
ADV7314 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
W
. The R
SET
values should not
be changed. R
LOAD
has a value of 150
W
with a 4 gain stage
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 amp data sheets.
An optional analog reconstruction low-pass filter (LPF) may be
required as an anti-imaging filter if the ADV7314 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
600
300
3
4
1
22pF
300
DAC OUTPUT
75
BNC OUTPUT
2.2 H
1.8k
Figure 54. Example for Output Filter for SD,
16 Oversampling
0
–5
–10
–15
–20
–25
–30
–35
–40
0
–30
–60
–90
–120
–150
–180
–210
–240
16n
14n
12n
10n
8n
6n
4n
2n
0
1M
10M
FREQUENCY (Hz)
100M
CIRCUIT FREQUENCY RESPONSE
GROUP DELAY (sec)
PHASE (Deg)
MAGNITUDE (dB)
G
Figure 55. Filter Plot for Output Filter for SD,
16 Oversampling
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