參數(shù)資料
型號(hào)： ADV7324
廠商： Analog Devices, Inc.
英文描述： Multiformat 216 MHz Video Encoder with Six NSV 14-Bit DACs
中文描述： 多格式視頻編碼器216兆赫六噪聲整形的14位DAC
文件頁數(shù)： 62/92頁
文件大?。?/td> 992K
代理商： ADV7324
ADV7324
BOARD DESIGN AND LAYOUT
DAC TERMINATION AND LAYOUT
CONSIDERATIONS
The ADV7324 contains an on-board voltage reference. The
ADV7324 can be used with an external V
REF
(AD1580).
Rev. 0 | Page 62 of 92
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 150
for half-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, Inc.,
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 ADV7324 is connected
to a device that requires 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
600
300
3
4
1
22pF
300
DAC OUTPUT
75
BNC OUTPUT
2.2
μ
H
1.8k
0
Figure 84. Example of 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 (Seconds)
PHASE (Degrees)
MAGNITUDE (dB)
G
0
Figure 85. Filter Plot for Output Filter for SD, 16× Oversampling
600
3
4
1
22pF
300
22pF
300
DAC OUTPUT
75
BNC OUTPUT
3.3
μ
H
1.8k
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 39. Possible Output Rates
from the ADV7324
Input Mode Address
0x01, Bit 6 to Bit 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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