參數(shù)資料
型號(hào)： ADV7321KSTZ
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 59/88頁(yè)
文件大?。?/td> 0K
描述： IC VID ENC 6-12BIT DAC'S 64LQFP
標(biāo)準(zhǔn)包裝： 1
類(lèi)型： 視頻編碼器
應(yīng)用： EVD，DVD，SD/PS/HDTV
電壓 - 電源，模擬： 2.5V
電壓 - 電源，數(shù)字： 2.5V
安裝類(lèi)型： 表面貼裝
封裝/外殼： 64-LQFP
供應(yīng)商設(shè)備封裝： 64-LQFP（10x10）
包裝： 托盤(pán)
ADV7320/ADV7321
Rev. A | Page 62 of 88
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 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 Ω. The RSET values should not be changed.
RLOAD has a value of 300 Ω 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 ADV7320/ADV7321 are
connected to a device that requires this filtering.
The filter specifications vary with the application.
Table 38. External Filter Requirements
Application
Oversampling
Cutoff
Frequency
(MHz)
Attenuation
–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
Ω
600
Ω
3
4
1
22pF
600
Ω
DAC
OUTPUT
75
Ω
BNC
OUTPUT
10
μH
560
Ω
05067-085
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
1M
10M
100M
FREQUENCY (Hz)
CIRCUIT FREQUENCY RESPONSE
1G
GROUP DELAY (Seconds)
PHASE (Degrees)
MAGNITUDE (dB)
21n
18n
15n
12n
9n
6n
3n
0
24n
GAIN
(
d
B)
05067-086
Figure 86. Filter Plot for Output Filter for SD, 16× Oversampling
560
Ω
3
4
1
6.8pF
600
Ω
6.8pF
600
Ω
DAC
OUTPUT
75
Ω
BNC
OUTPUT
4.7
μH
560
Ω
05067-087
Figure 87. Example of Output Filter for PS, 8× Oversampling
82pF
33pF
75
Ω
DAC
OUTPUT
220nH
470nH
500
Ω
3
4
1
BNC
OUTPUT
500
Ω
300
Ω
3
4
1
75
Ω
05067-088
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
PLL Address
0x00, Bit 1
Output Rate
(MHz)
SD Only
Off
27 (2×)
On
216 (16×)
PS Only
Off
27 (1×)
On
216 (8×)
HDTV Only
Off
74.25 (1×)
On
148.5 (2×)
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