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參數(shù)資料
| 型號： | ADV7197 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Multiformat HDTV Encoder with Three 11-Bit DACs |
| 中文描述： | 多格式HDTV編碼器三種11位DAC |
| 文件頁數(shù)： | 18/20頁 |
| 文件大?。?/td> | 229K |
| 代理商： | ADV7197 |
REV. 0
ADV7197
–18–
Video Output Buffer and Optional Output Filter
Output buffering is necessary in order to drive output devices,
s
uch as HDTV monitors.
Analog Devices produces a range of suitable op amps for this
application. A suitable op amp would be the AD8057. More
information on line driver buffering circuits is given in the rel-
evant op amp data sheets.
An optional analog reconstruction LPF might be required as an
antialias filter if the ADV7197 is connected to a device that
requires this filtering.
The Eval ADV7196/ADV7197EB evaluation board uses the
ML6426 Microlinear IC, which provides buffering and low-pass
filtering for HDTV applications.
The Eval ADV7196/ADV7197EB Rev. B and Rev. C evaluation
boards use the AD8057 as a buffer and a 6th order LPF.
The Application Note, AN-TBD, describes in detail these two
designs and should be consulted when designing external filter
and buffers for Analog Devices Video Encoders.
ADV7197
DAC A
DAC B
DAC C
LPF
AD8057
5V
75
0.1 F
0.1 F
5V
10 F
75 COAX
10 F
75
LPF
AD8057
–
5V
0.1 F
0.1 F
+5V
10 F
75 COAX
10 F
75
AD8057
–
5V
0.1 F
0.1 F
+5V
10 F
75 COAX
10 F
75
LPF
HDTV MONITOR
75
75
Figure 25. Output Buffer and Optional Filter
To calculate the output full-scale current and voltage, the fol-
lowing equations should be used:
V
OUT
=
I
OUT
×
R
LOAD
I
OUT
= (
V
REF
×
K
)/
R
SET
where:
K
= 5.66 (for input ranges 64–940, 64–960, output standards
EIA770.3)
K
= 6.46 (for input ranges 0–1023, output standards
RS170/343A
V
REF
= 1.235 V.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7197KS | 制造商:Analog Devices 功能描述:Video Encoder 3DAC 11-Bit 52-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:MULTI-FORMAT HDTV ENCODER, 3 11-BIT DACS - Bulk |
| ADV7197KST | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat HDTV Encoder with Three 11-Bit DACs |
| ADV7197KSZ | 制造商:Analog Devices 功能描述:Video Encoder 3DAC 11-Bit 52-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:MULTI-FORMAT HDTV ENCODER, 3 11-BIT DACS - Bulk |
| ADV7202 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Simultaneous Sampling Video Rate Codec |
| ADV7202KST | 制造商:Rochester Electronics LLC 功能描述:27MHZ DTV PICTURE IN PICTURE CODEC I.C. - Bulk 制造商:Analog Devices 功能描述: |
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