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AD8013AR-14 Fiches technique(PDF) 10 Page - Analog Devices |
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AD8013AR-14 Fiches technique(HTML) 10 Page - Analog Devices |
10 / 12 page AD8013 REV. A –10– 4 +VS AD8013 1.0µF 0.1µF 11 1.0µF 0.1µF –VS RG RT VIN 15 Ω CL VO RF RS Figure 28. Circuit for Driving a Capacitive Load Table II. Recommended Feedback and Series Resistors vs. Capacitive Load and Gain RS – Ohms CL – pF RF – Ohms G = 2 G ≥ 3 20 2k 25 15 50 2k 25 15 100 3k 20 15 200 4k 15 15 300 6k 15 15 ≥500 7k 15 15 10 0% 100 90 50ns 500mV 1V VIN VOUT Figure 29. Pulse Response Driving a Large Load Capacitor. CL = 300 pF, G = +2, RF = 6k, RS = 15 Ω Overload Recovery The three important overload conditions are: input common- mode voltage overdrive, output voltage overdrive, and input current overdrive. When configured for a low closed-loop gain, the amplifier will quickly recover from an input common- mode voltage overdrive; typically in under 25 ns. When con- figured for a higher gain, and overloaded at the output, the recovery time will also be short. For example, in a gain of +10, with 15% overdrive, the recovery time of the AD8013 is about 20 ns (see Figure 30). For higher overdrive, the response is somewhat slower. For 6 dB overdrive, (in a gain of +10), the recovery time is about 65 ns. 10 0% 100 90 50ns 500mV 5V VIN VOUT Figure 30. 15% Overload Recovery, G = +10 (RF = 300 Ω, RL = 1 k Ω, V S = ±5 V) As noted in the warning under “Maximum Power Dissipation,” a high level of input overdrive in a high noninverting gain circuit can result in a large current flow in the input stage. Though this current is internally limited to about 30 mA, its effect on the total power dissipation may be significant. High Performance Video Line Driver At a gain of +2, the AD8013 makes an excellent driver for a back terminated 75 Ω video line (Figures 31, 32, and 33). Low differential gain and phase errors and wide 0.1 dB bandwidth can be realized. The low gain and group delay matching errors ensure excellent performance in RGB systems. Figures 34 and 35 show the worst case matching. 75 Ω 75 Ω VOUT 75 Ω CABLE 75 Ω 75 Ω CABLE 4 +VS AD8013 0.1µF 11 0.1µF –VS RG VIN RF Figure 31. A Video Line Driver Operating at a Gain of +2 (RF = RG from Table I) FREQUENCY – Hz 1M 1G 10M 100M –6 +1 0 –1 –2 –3 –4 –5 0 –90 –180 –270 G = +2 RL = 150Ω VS = ±5V VS = +5V VS = +5V VS = ±5V GAIN PHASE Figure 32. Closed-Loop Gain & Phase vs. Frequency for the Line Driver FREQUENCY – Hz 1M 1G 10M 100M +0.1 0 –0.1 –0.2 –0.3 –0.4 –0.5 G = +2 RL = 150Ω VS = +5V VS = ±5V +0.2 Figure 33. Fine-Scale Gain Flatness vs. Frequency, G = +2, RL = 150 Ω |
Numéro de pièce similaire - AD8013AR-14 |
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Description similaire - AD8013AR-14 |
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