AD8143ACPZ-R2(Rev0) View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD8143ACPZ-R2
(Rev.:Rev0)

High Speed, Triple Differential Receiver with Comparators

Analog Devices 

The AD8134 encoding equations are given in Equation 3,

Equation 4, and Equation 5.

[ ] Red VCM

=

K

2

V

−H

(3)

[ ] Green VCM

=K

2

−2 V

(4)

[ ] Blue VCM

=

K

2

V

+H

(5)

AD8143

where:

Red VCM, Green VCM, and Blue VCM are the transmitted common-

mode voltages of the respective color signals.

K is a an adjustable gain constant that is set by the AD8134.

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

50Ω

RED CMV

50Ω

1kΩ

RECEIVED GREEN VIDEO

50Ω

GREEN CMV

50Ω

HSYNC

VSYNC

1kΩ

RECEIVED BLUE VIDEO

50Ω

BLUE CMV

50Ω

Figure 48. Extracting Sync Signals from Received Common-Mode Signals

Rev. 0 | Page 23 of 24

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