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AD8024AR-16 Datasheet(PDF) 9 Page - Analog Devices |
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AD8024AR-16 Datasheet(HTML) 9 Page - Analog Devices |
9 / 11 page AD8024 –9– REV. B General The AD8024 is a wide bandwidth, quad video amplifier. It offers a high level of performance on 16 mA total quiescent supply cur- rent for closed-loop gains of ±1 or greater. Bandwidth up to 380 MHz, low differential gain and phase errors, and high output current make the AD8024 an efficient video amplifier. The AD8024’s wide phase margin and high output current make it an excellent choice when driving any capacitive load. Choice of Feedback Resistor Because it is a current feedback amplifier, the closed-loop bandwidth of the AD8024 may be customized with the feed- back resistor. A larger feedback resistor reduces peaking and increases the phase margin at the expense of reduced bandwidth. A smaller feedback resistor increases bandwidth at the expense of increased peaking and reduced phase margin. The closed-loop bandwidth is affected by attenuation due to the finite output resistance. The open-loop output resistance of ≈6 Ω reduces the bandwidth somewhat when driving load resistors less than ≈150 Ω. The bandwidth will be ≈10% greater for load resis- tance above a few hundred ohms. The value of the feedback resistor is not critical unless maintaining the widest or flattest frequency response is desired. Table I shows the bandwidth at different supply voltages for some useful closed- loop gains when driving a 150 Ω load. The recommended resistors are for the widest bandwidth with less than 2 dB peaking. Table I. –3 dB Bandwidth vs. Closed-Loop Gain Resistor, RL = 150 VS – Volts Gain RF – BW – MHz ±7.5 +1 5000 350 +2 750 275 +10 400 105 –1 750 165 ±12 +1 8000 380 +10 215 150 –1 750 95 ±2.5 +2 1125 125 Driving Capacitive Loads When used in combination with the appropriate feedback resistor, the AD8024 will drive any load capacitance without oscillation. In accordance with the general rule for current feedback ampli- fiers, increased load capacitance requires the use of a higher feedback resistor for stable operation. Due to the high open-loop transresistance and low inverting input current of the AD8024, large feedback resistors do not create large closed-loop gain errors. In addition, the high output current allows rapid voltage slewing on large load capacitors. For wide bandwidth and clean pulse response, an additional small series output resistor of about 10 Ω is recommended. – + AD8024 RF RG RT RS +VS –VS 1.0 F 0.1 F 1.0 F 0.1 F CL VO VIN Figure 31. Circuit for Driving a Capacitive Load VOUT VIN 1V 20nS 2V Figure 32. Pulse Response Driving a Large Load Capacitance, CL = 300 pF, G = 3, RFB = 2.32 k Ω, RS = 10.5 Ω, RL = 1 kΩ, VS = ±7.5 V |
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