參數(shù)資料
型號(hào)： ADV7195
廠商： Analog Devices, Inc.
英文描述： Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs and 10-Bit Data Input
中文描述： 多格式逐行掃描/高清晰度電視編碼器三種11位DAC和10位數(shù)據(jù)輸入
文件頁(yè)數(shù)： 31/36頁(yè)
文件大?。?/td> 499K
代理商： ADV7195
REV. 0
ADV7195
–31–
Due to the high clock rates used, long clock lines to the ADV7195
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 ADV7195 should be located as close as possible to the
output connectors, thus minimizing noise pickup and reflec-
tions due to impedance mismatch.
For optimum performance, the analog outputs should be source
and load terminated, as shown in Figure 58. The termination
resistors should be as close as possible to the ADV7195 to mini-
mize 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,
s
uch 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.
ADV7195
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
75
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
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 termi-
nation 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.
相關(guān)PDF資料
PDF描述
ADV7195KST Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs and 10-Bit Data Input
ADV7196 Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs, 10-Bit Data Input, and Macrovision
ADV7196A Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs, 10-Bit Data Input, and Macrovision
ADV7196AKS Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs, 10-Bit Data Input, and Macrovision
ADV7197 Multiformat HDTV Encoder with Three 11-Bit DACs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADV7195KS 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 VID+PROGSCAN/HDTV ENCODERIC - Bulk
ADV7195KST 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs and 10-Bit Data Input
ADV7195KSZ 制造商:Analog Devices 功能描述:Video Encoder 3DAC 11-Bit 52-Pin MQFP
ADV7196 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs, 10-Bit Data Input, and Macrovision
ADV7196A 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs, 10-Bit Data Input, and Macrovision
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