Datasheet

ADV7125
Rev. C | Page 14 of 16
ANALOG SIGNAL INTERCONNECT
For optimum performance, the analog outputs should each
have a source termination resistance to ground of 75  (doubly
terminated 75  configuration). This termination resistance
should be as close as possible to the ADV7125 to minimize
reflections.
Place the ADV7125 as close as possible to the output connectors,
thus minimizing noise pickup and reflections due to impedance
mismatch.
The video output signals should overlay the ground plane and
not the analog power plane, thereby maximizing the high
frequency power supply rejection.
Additional information on PCB design is available in the
AN-333 Application Note, Design and Layout of a Video
Graphics System for Reduced EMI, which is available from
Analog Devices at www.analog.com.
35
36
37
33
31
27
R7 TO R0
41 TO 48
COMP V
AA
V
AA
V
AA
V
AA
V
REF
R
SET
IOR
75Ω 75Ω
75Ω
COAXIAL CABLE
75Ω
POWER SUPPLY DECOUPLIN
G
(0.1µF AND 0.01µF CAPACITOR
FOR EACH V
AA
GROUP )
AD1580
ADV7125
MONITOR (CRT)
1
2
BNC
CONNECTORS
COMPLEMENTARY
OUTPUTS
75Ω
1kΩ
R
SET
530Ω
IOG
IOB
12
SYNC
11
BLANK
24
CLOCK
38
PSAVE
GND
1, 2, 14, 15,
25, 26, 39, 40
13, 29,
30
VIDEO
DATA
INPUTS
G7 TO G0
3TO 10
B7 TO B0
16 TO 23
IOR
IOG
IOB
75Ω
75Ω
32
28
34
0.1µF
0.1µF
1µF
0.01µF
03097-010
Figure 10. Typical Connection Diagram