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參數(shù)資料
型號(hào)： ADV7321KSTZ
廠商： ANALOG DEVICES INC
元件分類： 顏色信號(hào)轉(zhuǎn)換
英文描述： Multiformat 216 MHz Video Encoder with Six NSV 12-Bit DACs
中文描述： COLOR SIGNAL ENCODER, PQFP64
封裝： LEAD FREE, PLASTIC, MS-026BCD, LQFP-64
文件頁(yè)數(shù)： 62/88頁(yè)
文件大小： 1002K
代理商： ADV7321KSTZ
ADV7320/ADV7321
BOARD DESIGN AND LAYOUT
DAC TERMINATION AND LAYOUT
CONSIDERATIONS
The ADV7320/ADV7321 contain an on-board voltage
reference. The ADV7320/ADV7321 can be used with an
external V
REF
(AD1580).
Rev. 0 | 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 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 to drive output
devices, such as SD or HD monitors. Analog Devices produces
a range of suitable op amps for this application, e.g., 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 ADV7320/ADV7321 are
connected to devices that require this filtering.
The filter specifications vary with the application.
Table 38. 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 85. 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 (Seconds)
PHASE (Degrees)
MAGNITUDE (dB)
21n
18n
15n
12n
9n
6n
3n
0
24n
G
0
Figure 86. 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 87. 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 88. Example of Output Filter for HDTV, 2× Oversampling
Table 39. Possible Output Rates
from the ADV7320/ADV7321
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)
參數(shù)描述
ADV7322 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat 11-Bit HDTV Video Encoder
ADV73225709 制造商:LG Corporation 功能描述:Frame Assembly
ADV73225710 制造商:LG Corporation 功能描述:Frame Assembly
ADV73225718 制造商:LG Corporation 功能描述:Frame Assembly
ADV73225719 制造商:LG Corporation 功能描述:Frame Assembly
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