Datasheet

AD8133
Rev. 0 | Page 14 of 16
APPLICATIONS
DRIVING RGB VIDEO SIGNALS OVER CATEGORY-5
UTP CABLE
The foremost application of the AD8133 is driving RGB video
signals over UTP cable in KVM networks. Single-ended video
signals are easily converted to differential signals for
transmission over the cable, and the internally fixed gain of 2
automatically compensates for the losses incurred by the source
and load terminations. The common topologies used in KVM
networks, such as daisy-chained, star, and point-to-point, are
supported by the AD8133. Figure 36 shows the AD8133 in a
triple single-ended-to-differential application when driven from
a 75 Ω source, which is typical of how RGB video is driven over
an UTP cable. In applications that use the OPD feature, the
Schottky diodes are placed in series with each of the 49.9 Ω
resistors in the outputs.
V
OCM
+2.5V
–
OUT A
+
A
1.5kΩ
VIDEO
SOURCE A
1.5kΩ
AD8133
750Ω
80.6Ω
38.3Ω
38.3Ω
38.3Ω
750Ω
49.9Ω
49.9Ω
75Ω
V
OCM
+2.5V
–
OUT B
+
B
1.5kΩ
VIDEO
SOURCE B
1.5k
750Ω
80.6Ω
OUTPUT
PULLDOWN
750Ω
49.9Ω
49.9Ω
75Ω
V
OCM
+2.5V
–
OUT C
+
C
1.5kΩ
VIDEO
SOURCE C
1.5kΩ
750Ω
80.6Ω
750Ω
OPD
49.9Ω
49.9Ω
75Ω
04769-0-002
+5V
V
S+
0.1µF ON ALL V
S+
PINS
V
S–
Figure 36. AD8133 in Single-Ended-to-Differential Application