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ADV7195
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.
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.
+5V
0.1 F
10 F
DAC A
LPF
75
COAX
AD8057
75
0.1 F
10 F
75
ADV7195
– 5V
+5V
PROGRESSIVE
SCAN
0.1 F
10 F
MONITOR
DAC B
LPF
AD8057
75
75
0.1 F
COAX
10 F
75
+5V
+5V
0.1 F
10 F
DAC C
LPF
75
COAX
AD8057
75
0.1 F
10 F
75
– 5V
Figure 58. Output Buffer and Optional Filter
REV. A
–31 –
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