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AD8074ARUZ-REEL7 датащи(PDF) 10 Page - Analog Devices |
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AD8074ARUZ-REEL7 датащи(HTML) 10 Page - Analog Devices |
10 / 15 page AD8074/AD8075 –10– RGB Buffer for Second Monitor 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. A second monitor that is connected simply in parallel will pro- vide an extra set of terminations that will upset the signal levels. To keep costs low, most computer monitors do not have the ability to open-circuit the terminations in order that an additional monitor can be connected to the same signal, as is done in some studio- type TV monitors. A way around this problem is to connect the first monitor to the RGB channels in the standard fashion, and then to provide a triple gain-of-two buffer to drive the second monitor. The AD8075 is designed to provide this function and also provide excellent high-frequency performance for high-resolution graphics signals. Figure 3 shows a schematic of this circuit. The outputs of the AD8075 are low impedance voltage sources and are therefore series-terminated with 75 Ω resistors. The internal resistors in Monitor #2 provide the terminations at its end. The overall effect of this type of termination scheme is to divide the signal amplitude by two. This is compensated by the gain of two provided by the AD8075. 0.1 F –5V 0.1 F –5V 0.1 F –5V + 25 F 0.1 F +5V 0.1 F +5V 0.1 F +5V + 25 F AD8075 75 75 75 75 75 75 75 75 75 MONITOR #1 MONITOR #2 INTERNAL TERMINATIONS INTERNAL TERMINATIONS 75 75 75 R G B PC GRAPHICS IC CURRENT SOURCE OUTPUT DRIVERS Figure 3. Buffer Rev. B |
Аналогичный номер детали - AD8074ARUZ-REEL7 |
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Аналогичное описание - AD8074ARUZ-REEL7 |
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