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AD8010AR-REEL7 Datasheet(PDF) 11 Page - Analog Devices |
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AD8010AR-REEL7 Datasheet(HTML) 11 Page - Analog Devices |
11 / 12 page AD8010 –11– REV. A Closed-Loop Gain and Bandwidth The AD8010 is a current feedback amplifier optimized for use in high performance video and data acquisition applications. Since it uses a current feedback architecture, its closed-loop –3 dB bandwidth is dependent on the magnitude of the feed- back resistor. The desired closed-loop bandwidth and gain are obtained by varying the feedback resistor (RF) to set the band- width, and varying the gain resistor (RG) to set the desired gain. The characteristic curves and specifications for this data sheet reflect the performance of the AD8010 using the values of RF noted at the top of the specifications table. If a greater –3 dB band- width and/or slew rate is required (at the expense of video per- formance), Table I provides the recommended resistor values. Figure 32 shows the test circuit and conditions used to produce Table I. Effect of Feedback Resistor Tolerance on Gain Flatness Because of the relationship between the 3 dB bandwidth and the feedback resistor, the fine scale gain flatness will, to some ex- tent, vary with feedback resistor tolerance. It is therefore recom- mended that resistors with a 1% tolerance be used if it is desired to maintain flatness over a wide range of production lots. In addition, resistors of different construction have different associ- ated parasitic capacitance and inductance. Metal-film resistors were used for the bulk of the characterization for this data sheet. It is possible that values other than those indicated will be opti- mal for other resistor types. Quality of Coaxial Cable Optimum flatness when driving a coax cable is possible only when the driven cable is terminated at each end with a resistor matching its characteristic impedance. If the coax was ideal, then the resulting flatness would not be affected by the length of the cable. While outstanding results can be achieved using inex- pensive cables, it should be noted that some variation in flatness due to varying cable lengths may be experienced. 150 50 RF RG VOUT 18.75 VIN Figure 32. Test Circuit for Table I NOTES 1V O = 0.2 V p-p for –3 dB Bandwidth. 2V O = 2 V p-p for Slew Rate. 3Bypassing per Figure 29. Table I. –3 dB Bandwidth and Slew Rate vs. Closed-Loop Gain and Resistor Values Package: N-8 Closed-Loop –3 dB BW Slew Rate Gain RF ( )RG ( ) (MHz) (V/ s) +1 453 ∞ 285 900 +2 374 374 255 900 +5 348 86.6 200 800 +10 562 61.9 120 550 Package: R-16 Closed-Loop –3 dB BW Slew Rate Gain RF ( )RG ( ) (MHz) (V/ s) +1 412 ∞ 245 900 +2 392 392 220 900 +5 392 97.6 160 800 +10 604 66.5 95 550 Package: SO-8 Closed-Loop –3 dB BW Slew Rate Gain RF ( )RG ( ) (MHz) (V/ s) +1 392 ∞ 345 950 +2 374 374 305 1000 +5 348 86.6 220 1000 +10 499 54.9 135 650 |
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