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AD8143 Datasheet(PDF) 23 Page - Analog Devices

Part # AD8143
Description  High Speed, Triple Differential Receiver with Comparators
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8143 Datasheet(HTML) 23 Page - Analog Devices

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AD8143
Rev. 0 | Page 23 of 24
where:
The AD8134 encoding equations are given in Equation 3,
Equation 4, and Equation 5.
[
]
(3)
Red VCM, Green VCM, and Blue VCM are the transmitted common-
mode voltages of the respective color signals.
H
V
K
V
Red
CM
=
2
[ V
2
2
= K
V
Green
CM
]
(4)
K is a an adjustable gain constant that is set by the AD8134.
[ H
V
K
V
Blue
CM
+
=
2
]
(5)
V and H are the vertical and horizontal sync pulses, defined
with a weight of −1 when the pulses are in their low states, and a
weight of +1 when they are in their high states.
The AD8134 data sheet contains further details regarding the
encoding scheme.
Figure 48 illustrates how the AD8143 comparators can be used
to extract the horizontal and vertical sync pulses that are
encoded on the RGB common-mode voltages by the AD8134.
RECEIVED RED VIDEO
HSYNC
RED CMV
GREEN CMV
BLUE CMV
50
Ω
50
Ω
1k
Ω
1k
Ω
VSYNC
RECEIVED GREEN VIDEO
50
Ω
50
Ω
RECEIVED BLUE VIDEO
50
Ω
50
Ω
Figure 48. Extracting Sync Signals from Received Common-Mode Signals


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