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AD8074/AD8075,pdf datasheet (3
王秀兰
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The RGB signals for PC monitors are driven through coax
cables whose characteristic impedance is 75 Ω. The graphics
chip will generally have current-source output drivers that should
be double terminated with a 75 Ω shunt termination at each end.
On the transmit end, the shunt terminations are provided to
ground close to the graphics IC, while the monitor terminates
its end via internal termination resistors. While this scheme works
well and is virtually foolproof for a single monitor, it leaves no
means for passively connecting a second monitor to the same source.
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