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AD811AR-20-REEL Scheda tecnica(PDF) 11 Page - Analog Devices |
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AD811AR-20-REEL Scheda tecnica(HTML) 11 Page - Analog Devices |
11 / 15 page AD811 REV. D –11– Operation as a Video Line Driver The AD811 has been designed to offer outstanding perfor- mance at closed-loop gains of one or greater, while driving multiple reverse-terminated video loads. The lowest differential gain and phase errors will be obtained when using ±15 volt power supplies. With ±12 volt supplies, there will be an insig- nificant increase in these errors and a slight improvement in gain flatness. Due to power dissipation considerations, ±12 volt supplies are recommended for optimum video performance. Excellent performance can be achieved at much lower supplies as well. The closed-loop gain vs. frequency at different supply voltages is shown in Figure 36. Figure 37 is an oscilloscope photograph of an AD811 line driver’s pulse response with ±15 volt supplies. The differential gain and phase error vs. supply are plotted in Figures 38 and 39, respectively. Another important consideration when driving multiple cables is the high frequency isolation between the outputs of the cables. Due to its low output impedance, the AD811 achieves better than 40 dB of output to output isolation at 5 MHz driv- ing back terminated 75 Ω cables. 75 CABLE VIN –VS +VS 0.1 F 0.1 F AD811 VOUT #2 VOUT #1 75 CABLE 75 CABLE 75 75 75 75 75 649 649 Figure 35. A Video Line Driver Operating at a Gain of +2 12 –6 3 –3 0 1 9 6 10 100 FREQUENCY – MHz G = +2 RL = 150 RG = RFB VS = 15V RFB = 649 VS = 5V RFB = 562 Figure 36. Closed-Loop Gain vs. Frequency, Gain = +2 10 90 100 0% 1V 1V 10ns VIN VOUT Figure 37. Small Signal Pulse Response, Gain = +2, VS = ±15 V 0.10 15 0.03 0.01 6 0.02 5 0.06 0.04 0.05 0.07 0.08 0.09 14 13 12 11 10 9 8 7 SUPPLY VOLTAGE – Volts RF= 649 FC= 3.58MHz 100 IRE MODULATED RAMP a b DRIVING A SINGLE, BACK TERMINATED, 75 COAX CABLE DRIVING TWO PARALLEL, BACK TERMINATED, COAX CABLES a. b. Figure 38. Differential Gain Error vs. Supply Voltage for the Video Line Driver of Figure 35 0.20 15 0.06 0.02 6 0.04 5 0.12 0.08 0.10 0.14 0.16 0.18 14 13 12 11 10 9 8 7 SUPPLY VOLTAGE – Volts RF = 649 FC = 3.58MHz 100 IRE MODULATED RAMP a b DRIVING A SINGLE, BACK TERMINATED, 75 COAX CABLE DRIVING TWO PARALLEL, BACK TERMINATED, COAX CABLES a. b. Figure 39. Differential Phase Error vs. Supply Voltage for the Video Line Driver of Figure 35 |
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