參數(shù)資料
型號： ADV7304AKST
廠商： ANALOG DEVICES INC
元件分類： 顏色信號轉(zhuǎn)換
英文描述： Multiformat SD, Progressive Scan/HDTV Video Encoder with Six NSV 14-Bit DACs
中文描述： COLOR SIGNAL ENCODER, PQFP64
封裝： PLASTIC, MS-026BCD, LQFP-64
文件頁數(shù)： 49/68頁
文件大小： 2007K
代理商： ADV7304AKST
REV. A
ADV7304A/ADV7305A
–49–
SD ACTIVE VIDEO EDGE
[Subaddress 42h, Bit 7]
When the active video edge is enabled, the first three pixels and
the last three pixels of the active video on the Luma Channel are
scaled in such a way that maximum transitions on these pixels
are not possible. The scaling factors are 1/8 , 1/2 , and 7/8 .
All other active video passes through unprocessed.
100 IRE
0 IRE
100 IRE
12.0 IRE
50 IRE
LUMA CHANNEL WITH
ACTIVE VIDEO EDGE
DISABLED
LUMA CHANNEL WITH
ACTIVE VIDEO EDGE
ENABLED
Figure 72. Active Video Edge Functionality Example
BOARD DESIGN AND LAYOUT CONSIDERATIONS
DAC Termination and Layout Considerations
The ADV7304A/ADV7305A contain an on-board voltage refer-
ence. The V
REF
pin is normally terminated to V
AA
through a
0.1
μ
F capacitor when the internal V
REF
is used. Alternatively,
the ADV7304A/ADV7305A can be used with an external V
REF
(e.g.,
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 760
. The R
SET
values should not be changed. R
LOAD
has a value of 150
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 LPF might be required as an
antialias filter if the ADV7304A/ADV7305A is connected to a
device that requires this filtering. The filter specifications vary
with the application, see Table XXIII.
Table XXIII. External Filter Requirements
Input
Mode
External Filter Cutoff
Oversampling
Frequency Attenuation
SD
SD
PS
PS
HDTV 1
HDTV 2
2
8
1
4
>6.5 MHz
>6.5 MHz
>12.5 MHz
–
50 dB @ 14.5 MHz
>12.5 MHz
–
50 dB @ 95.5 MHz
>30 MHz
–
50 dB @ 44.25 MHz
>30 MHz
–
50 dB @ 118.5 MHz
–
50 dB @ 20.5 MHz
–
50 dB @ 101.5 MHz
600R
1.8k
300R
47pF
300R
DAC O/P
75R
BNC O/P
6.8 H
6.8 H
Figure 73. Example for Output Filter for SD,
8 Oversampling
CIRCUIT FREQUENCY RESPONSE – MHz
–60
1
10
100
0n
–240
6n
–120
12n
0
18n
120
24n
240
30n
360
36n
480
–50
–40
–30
–20
–10
0
GROUP DELAY (sec)
PHASE (Deg)
MAGNITUDE (dB)
T
Figure 74. Filter Plot for Output Filter for SD,
8 Oversampling
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