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AD8014ART-R2 数据表(PDF) 9 Page - Analog Devices |
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AD8014ART-R2 数据表(HTML) 9 Page - Analog Devices |
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9 / 11 page  AD8014 –9– DRIVING CAPACITIVE LOADS The AD8014 was designed primarily to drive nonreactive loads. If driving loads with a capacitive component is desired, best settling response is obtained by the addition of a small series resistance as shown in Figure 26. The accompanying graph shows the optimum value for RSERIES vs. Capacitive Load. It is worth noting that the frequency response of the circuit when driving large capacitive loads will be dominated by the passive roll-off of RSERIES and CL. 40 30 20 010 15 20 25 CL – pF 10 5 Figure 26. Driving Capacitive Load Choosing Feedback Resistors Changing the feedback resistor can change the performance of the AD8014 like any current feedback op amp. The table below illustrates common values of the feedback resistor and the per- formance which results. Table II. –3 dB BW –3 dB BW VO = 0.2 V VO = 0.2 V Gain RF RG RL = 1 k RL = 150 +1 1 k Ω Open 480 430 +2 1 k Ω 1 k Ω 280 260 +10 1 k Ω 111 Ω 50 45 –1 1 k Ω 1 k Ω 160 150 –2 1 k Ω 499 Ω 140 130 –10 1 k Ω 100 Ω 45 40 +2 2 k Ω 2 k Ω 200* 180* +2 750 Ω 750 Ω 260* 210* +2 499 Ω 499 Ω 280* 230* *VO = ±1 V. Video Drivers The AD8014 easily drives series terminated cables with video signals. Because the AD8014 has such good output drive you can parallel two or three cables driven from the same AD8014. Figure 23 shows the differential gain and phase driving one video cable. Figure 24 shows the differential gain and phase driving two video cables. Figure 25 shows the differential gain and phase driving three video cables. 0.10 0.05 0.00 –0.05 –0.10 0.60 0.40 0.20 –0.20 –0.40 0.00 –0.60 0.00 0.02 0.04 0.05 0.05 0.05 0.04 0.04 0.04 0.04 0.03 0.00 0.01 0.10 0.21 0.26 0.28 0.29 0.30 0.30 0.30 0.30 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH Figure 23. Differential Gain and Phase RF = 500, ±5 V, RL = 150 Ω, Driving One Cable, G = +2 0.30 0.20 0.10 –0.10 –0.20 0.60 0.40 0.20 –0.20 –0.40 0.00 –0.60 0.00 –0.02 0.03 0.05 0.06 0.06 0.05 0.05 0.07 0.10 0.14 0.00 0.07 0.24 0.40 0.43 0.44 0.43 0.40 0.35 0.26 0.16 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH 0.00 –0.30 Figure 24. Differential Gain and Phase RF = 500, ±5 V, RL = 75 Ω, Driving Two Cables, G = +2 0.60 0.40 0.20 –0.40 –0.60 0.00 –0.80 0.00 0.44 0.52 0.54 0.52 0.52 0.50 0.48 0.47 0.44 0.45 0.00 0.10 0.32 0.53 0.57 0.59 0.58 0.56 0.54 0.51 0.48 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH –0.20 0.80 0.60 0.40 0.20 –0.40 –0.60 0.00 –0.80 –0.20 0.80 Figure 25. Differential Gain and Phase RF = 500, ±5 V, RL = 50 Ω, Driving Three Cables, G = +2 Rev. C |
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