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參數資料
| 型號： | AD8148ACPZ-RL |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Triple Differential Driver for Wideband Video |
| 中文描述： | 三差分驅動器的寬帶視頻 |
| 文件頁數： | 16/24頁 |
| 文件大小： | 438K |
| 代理商： | AD8148ACPZ-RL |
AD8146/AD8147/AD8148
APPLICATIONS
DRIVING RGB VIDEO SIGNALS OVER CATEGORY-5
UTP CABLE
The foremost application of the drivers is the transmission of
RGB video signals over UTP cable in KVM networks. The
excellent balance of the differential outputs ensures low radiated
energy from each of the twisted pairs. Single-ended video signals
are easily converted to differential signals for transmission over
the cable, and the internally fixed gain of 2 or 4 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 drivers. Figure 29 shows the AD8146 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.
Rev. 0 | Page 16 of 24
V
OCM
+2.5V
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OUT A
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VIDEO
SOURCE A
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AD8146
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82.5
39.2
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39.2
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49.9
49.9
75
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+2.5V
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OUT B
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B
1k
VIDEO
SOURCE B
1k
500
82.5
OUTPUT
PULLDOWN
500
49.9
49.9
75
V
OCM
+2.5V
–
OUT C
+
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VIDEO
SOURCE C
1k
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OPD
49.9
49.9
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+5V
V
S+
0.1μF ON ALL V
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PINS
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S–
0
Figure 29. AD8146 in Single-Ended-to-Differential Application
VIDEO SYNC-ON COMMON-MODE
In computer video applications, the horizontal and vertical sync
signals are often separate from the video information signals.
For example, in typical computer monitor applications, the red,
green, and blue (RGB) color signals are transmitted over separate
cables, as are the vertical and horizontal sync signals. When
transmitting these types of video signals over long distances on
UTP cable, it is desirable to reduce the required number of
physical channels. One way to do this is to encode the vertical
and horizontal sync signals as weighted sums and differences of
the output common-mode signals. The RGB color signals are
each transmitted differentially over separate physical channels.
The fact that the differential and common-mode signals are
orthogonal allows the RGB color and sync signals to be
separated at the channel’s receiver.
Cat-5 cable contains four balanced twisted-pair physical
channels that can support both differential and common-mode
signals. Transmitting typical computer monitor video over this
cable can be accomplished by using three of the twisted pairs for
the RGB and sync signals and one wire of the fourth pair as a
return path for the Schottky diode bias currents. Each color is
transmitted differentially, one on each of the three pairs, and the
encoded sync signals are transmitted among the common-mode
signals of each of the three pairs. To minimize EMI from the
sync signals, the common-mode signals on each of the three
pairs produced by the sync encoding scheme induce electric
and magnetic fields that for the most part cancel each other. A
conceptual block diagram of the sync encoding scheme is
presented in Figure 30. Because the AD8147/AD8148 have the
sync encoding scheme implemented internally, the user simply
applies the horizontal and vertical sync signals to the appropriate
inputs. (See the Specifications tables for the high and low levels
of the horizontal and vertical sync pulse voltages).
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