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參數(shù)資料
| 型號： | ADV7322 |
| 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)： | 62/88頁 |
| 文件大?。?/td> | 991K |
| 代理商： | ADV7322 |
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ADV7322
Preliminary Technical Data
BOARD DESIGN AND LAYOUT
DAC TERMINATION AND LAYOUT
CONSIDERATIONS
The ADV7322 contains an on-board voltage reference. The
ADV7322 can be used with an external V
REF
(AD1580).
Rev. PrA | Page 62 of 88
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 RSET 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 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 ADV7322 is connected
to a device that requires this filtering.
The filter specifications vary with the application.
Table 36. External Filter Requirements
Application
SD
SD
PS
PS
HDTV
HDTV
Oversampling
2×
16×
1×
8×
1×
2×
Cutoff
Frequency
(MHz)
>6.5
>6.5
>12.5
>12.5
>30
>30
Attenuation
–50 dB @
(MHz)
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
μ
H
560
0
Figure 84. 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
0
Figure 85. Filter Plot for Output Filter for SD, 16× Oversampling
560
3
4
1
6.8pF
600
6.8pF
600
DAC
OUTPUT
75
BNC
OUTPUT
4.7
μ
H
560
0
Figure 86. Example of Output Filter for PS, 8× Oversampling
82pF
33pF
75
DAC
OUTPUT
220nH
470nH
500
3
4
1
BNC
OUTPUT
500
300
3
4
1
75
0
Figure 87. Example of Output Filter for HDTV, 2× Oversampling
Table 37. Possible Output Rates from the ADV7322
Input Mode Address
0x01, Bits 6 to 4
SD Only
PLL Address
0x00, Bit 1
Off
On
Off
On
Off On
Output Rate
(MHz)
27 (2×)
216 (16×)
27 (1×)
216 (8×)
74.25 (1×)
148.5 (2×)
PS Only
HDTV Only
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相關(guān)代理商/技術(shù)參數(shù) |
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| ADV73225709 | 制造商:LG Corporation 功能描述:Frame Assembly |
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| ADV73225801 | 制造商:LG Corporation 功能描述:Frame Assembly |
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