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AD8010AR-REEL7 데이터시트(PDF) 10 Page - Analog Devices |
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AD8010AR-REEL7 데이터시트(HTML) 10 Page - Analog Devices |
10 / 12 page AD8010 –10– REV. A Differential Line Driver Twisted pair transmission lines are more often being used for high frequency analog and digital signals. Over long distances, however, the attenuation characteristics of these lines can degrade the performance of the transmission system. To com- pensate for this, larger signals are transmitted, which after the attenuation, will still have useful signal strength. The high output current of two AD8010s can be used along with a transformer to create a high power differential line driver. The differential configuration effectively doubles the output swing, while the step-up transformer further increases the out- put voltage. In the circuit in Figure 31 the A device is configured as a gain- of-two follower, while the B device is a gain-of-two inverter. These will produce a differential output signal whose maximum value is twice the peak-to-peak value of the maximum output of one device. For this circuit a 12 V peak-to-peak output can be obtained. The op amps drive a 1:2 step-up transformer that drives a 100 Ω transmission line. Since the impedance reflected back to the primary varies as the square of the turns ratio, it will appear as 25 Ω at the primary. This source terminating resistor is split as a 12.4 Ω resistor at the output of each device. The circuit shown is capable of delivering 12 V p-p to the line and operates with a –3 dB bandwidth of 40 MHz. The peak current output of either op amp is 100 mA. Figure 31. High Output Differential Line Driver Using Two AD8010s. NOTE: Please see Figure 29 for Recommended Bypassing Technique. AD8010 VIN 499 499 150 402 AD8010 150 806 12.4 12.4 +6 –6 1:2 100 |
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