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.

+2.5V

–

OUT A

+

A

1.5k

Ω

VIDEO

SOURCE A

1.5k

Ω

AD8133

750

Ω

80.6

Ω

38.3

Ω

38.3

Ω

38.3

Ω

750

Ω

49.9

Ω

49.9

Ω

75

Ω

+2.5V

–

OUT B

+

B

1.5k

Ω

VIDEO

SOURCE B

1.5k

750

Ω

80.6

Ω

OUTPUT

PULLDOWN

750

Ω

49.9

Ω

49.9

Ω

75

Ω

+2.5V

–

OUT C

+

C

1.5k

Ω

VIDEO

SOURCE C

1.5k

Ω

750

Ω

80.6

Ω

750

Ω

OPD

49.9

Ω

49.9

Ω

75

Ω

+5V

0.1

µF ON ALL V

Figure 36. AD8133 in Single-Ended-to-Differential Application