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AD8143ACPZ-R2 データシート(PDF) 23 Page - Analog Devices |
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AD8143ACPZ-R2 データシート(HTML) 23 Page - Analog Devices |
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23 / 24 page ![]() 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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