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AD8009 데이터시트(PDF) 10 Page - Analog Devices |
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AD8009 데이터시트(HTML) 10 Page - Analog Devices |
10 / 12 page AD8009 –10– REV. B 10 F + 0.1 F AD8009 75 301 5V 301 2 7 3 6 + 10 F 0.1 F 4 –5V AD8009 75 301 301 2 3 6 AD8009 75 301 301 2 3 6 75 75 75 75 COAX PRIMARY MONITOR ADDITIONAL MONITOR 75 COAX 75 75 75 75 75 75 RED GREEN BLUE RED GREEN BLUE IOUTR ADV7160 ADV7162 IOUTG IOUTB Figure 38. Driving an Additional High Resolution Monitor Using Three AD8009s RGB Monitor Driver High resolution computer monitors require very high full power bandwidth signals to maximize their display resolution. The RGB signals that drive these monitors are generally provided by a current-out RAMDAC that can directly drive a 75 Ω doubly terminated line. There are times when the same output wants to be delivered to additional monitors. The termination provided internally by each monitor prohibits the ability to simply connect a second monitor in parallel with the first. Additional buffering must be provided. Figure 38 shows a connection diagram for two high resolution monitors being driven by an ADV7160 or ADV7162, a 220 MHz (Mega-pixel per second) triple RAMDAC. This pixel rate requires a driver whose full power bandwidth is at least half the pixel rate or 110 MHz. This is to provide good resolution for a worst case signal that swings between zero scale and full scale on adjacent pixels. The primary monitor is connected in the conventional fashion with a 75 Ω termination to ground at each end of the 75 Ω cable. Sometimes this configuration is called “doubly termi- nated” and is used when the driver is a high output impedance current source. For the additional monitor, each of the RGB signals close to the RAMDAC output is applied to a high input impedance, noninvert- ing input of an AD8009 that is configured for a gain of +2. The outputs each drive a series 75 Ω resistor, cable and termination resistor in the monitor that divides the output signal by two, thus providing an overall unity gain. This scheme is referred to as “back termination” and is used when the driver is a low output impedance voltage source. Back termination requires that the voltage of the signal be double the value that the monitor sees. Double termination requires that the output current be double the value that flows in the monitor termination. |
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