參數(shù)資料
型號(hào): ADV7311KST
廠商: Analog Devices Inc
文件頁(yè)數(shù): 51/84頁(yè)
文件大?。?/td> 0K
描述: IC VID ENC 6-12BIT DAC'S 64LQFP
產(chǎn)品變化通告: ADV7xxx Obsolescence 16/Jan/2012
標(biāo)準(zhǔn)包裝: 1
類型: 視頻編碼器
應(yīng)用: DVD,SD/HD
電壓 - 電源,模擬: 2.5V
電壓 - 電源,數(shù)字: 2.5V
安裝類型: 表面貼裝
封裝/外殼: 64-LQFP
供應(yīng)商設(shè)備封裝: 64-LQFP(14x14)
包裝: 托盤
REV. A
ADV7310/ADV7311
–55–
BOARD DESIGN AND LAYOUT CONSIDERATIONS
DAC Termination and Layout Considerations
The ADV7310/ADV7311 contain an on-board voltage reference.
The ADV7310/ADV7311 can be used with an external VREF
(AD1580).
The RSET resistors are connected between the RSET pins and
AGND and are used to control the full-scale output current and
therefore the DAC voltage output levels. For full-scale output,
RSET must have a value of 3040
. The R
SET values should not
be changed. RLOAD 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 ADV7310/ADV7311 is
connected to a device that requires this filtering.
The filter specifications vary with the application.
Table XVI. External Filter Requirements
Cutoff
Frequency Attenuation
Application Oversampling
(MHz)
–50 dB @ (MHz)
SD
2
×
>6.5
20.5
SD
16
×
>6.5
209.5
PS
1
×
>12.5
14.5
PS
8
×
>12.5
203.5
HDTV
1
×
>30
44.25
HDTV
2
×
>30
118.5
560
600
3
4
1
22pF
600
DAC
OUTPUT
75
BNC
OUTPUT
10 H
560
Figure 55. 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
1M
10M
100M
FREQUENCY (Hz)
CIRCUIT FREQUENCY RESPONSE
1G
GROUP DELAY (sec)
PHASE (Deg)
MAGNITUDE (dB)
21n
18n
15n
12n
9n
6n
3n
0
24n
GAIN
(dB)
Figure 56. Filter Plot for Output Filter for SD,
16
× Oversampling
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