參數(shù)資料
型號(hào)： ADV7196AKS
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs, 10-Bit Data Input, and Macrovision
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP52
封裝： PLASTIC, MQFP-52
文件頁數(shù)： 31/36頁
文件大小： 501K
代理商： ADV7196AKS
REV. 0
ADV7196A
–31–
ADV7196A
DAC A
DAC B
DAC C
AD8057
+5V
+5V
75 COAX
75
AD8057
–
5V
0.1 F
10 F
+5V
75 COAX
75
AD8057
–
5V
+5V
75 COAX
75
PROGRESSIVE
SCAN
MONITOR
75
LPF
LPF
LPF
0.1 F
10 F
0.1 F
10 F
0.1 F
10 F
0.1 F
10 F
0.1 F
10 F
75
75
Figure 58. Output Buffer and Optional Filter
DAC output traces on a PCB should be treated as transmission
lines. It is recommended that the DACs be placed as close as
possible to the output connector, with the analog output traces
being as short as possible (less than 3 inches). The DAC termina-
tion resistors should be placed as close as possible to the DAC
outputs and should overlay the PCB’s ground plane. As well as
minimizing reflections, short analog output traces will reduce noise
pickup due to neighboring digital circuitry
.
Supply Decoupling
Noise on the analog power plane can be further reduced by the
use of decoupling capacitors.
Optimum performance is achieved by the use of 0.1
μ
F ceramic
capacitors. Each of group of
V
AA
or
V
DD
pins should be indi-
vidually decoupled to ground. This should be done by placing
the capacitors as close as possible to the device with the capaci-
tor leads as short as possible, thus minimizing lead inductance
.
Digital Signal Interconnect
The digital signal lines should be isolated as much as possible
from the analog outputs and other analog circuitry. Digital signal
lines should not overlay the analog power plane.
Due to the high clock rates used, long clock lines to the ADV7196A
should be avoided to minimize noise pickup. Any active pull-up
termination resistors for the digital inputs should be connected
to the digital power plane and not the analog power plane
.
Analog Signal Interconnect
The ADV7196A should be located as close as possible to the output
connectors thus minimizing noise pickup and reflections due to
impedance mismatch.
For optimum performance, the analog outputs should each have
a source termination resistance to ground of 75
. This termina-
tion resistance should be as close as possible to the ADV7196A
to minimize reflections.
Any unused inputs should be tied to ground
.
Video Output Buffer and Optional Output Filter
Output buffering is necessary in order to drive output devices
,
such as progressive scan or HDTV monitors
.
Analog Devices produces a range of suitable op amps for this
application. Suitable op amps would be the AD8009, AD8002,
AD8001, or AD8057. More information on line driver buffering
circuits is given in the relevant op amp data sheets.
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADV7197 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat HDTV Encoder with Three 11-Bit DACs
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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
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