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AD8002AN bảng dữ liệu(PDF) 11 Page - Analog Devices |
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AD8002AN bảng dữ liệu(HTML) 11 Page - Analog Devices |
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11 / 18 page  REV. C AD8002 –11– Driving Capacitive Loads The AD8002 was designed primarily to drive nonreactive loads. If driving loads with a capacitive component is desired, best frequency response is obtained by the addition of a small series resistance as shown in Figure 42. The accompanying graph 909 RSERIES RL 500 IN CL Figure 42. Driving Capacitive Loads 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 0 025 30 10 5 20 15 20 10 CL – pF Figure 43. Recommended RSERIES vs. Capacitive Load Communications Distortion is a key specification in communications applications. Intermodulation distortion (IMD) is a measure of the ability of an amplifier to pass complex signals without the generation of spurious harmonics. The third order products are usually the most problematic since several of them fall near the fundamen- tals and do not lend themselves to filtering. Theory predicts that the third order harmonic distortion components increase in power at three times the rate of the fundamental tones. The specification of third order intercept as the virtual point where fundamental and harmonic power are equal is one standard measure of distortion performance. Op amps used in closed- loop applications do not always obey this simple theory. At a gain of two, the AD8002 has performance summarized in Fig- ure 44. Here the worst third order products are plotted vs. input power. The third order intercept of the AD8002 is +33 dBm at 10 MHz. –80 3 –7 –75 2 1 0 –4 –5 6 –2 –70 –65 –60 –55 –50 –45 –1 INPUT POWER – dBm –6 –8 4 5 –3 2F2 – F1 2F1 – F2 G = +2 F1 = 10MHz F2 = 12MHz Figure 44. Third Order IMD; F1 = 10 MHz, F2 = 12 MHz Operation as a Video Line Driver The AD8002 has been designed to offer outstanding perfor- mance as a video line driver. The important specifications of differential gain (0.01%) and differential phase (0.02 °) meet the most exacting HDTV demands for driving one video load with each amplifier. The AD8002 also drives four back terminated loads (two each), as shown in Figure 45, with equally impressive performance (0.01%, 0.07 °). Another important consideration is isolation between loads in a multiple load application. The AD8002 has more than 40 dB of isolation at 5 MHz when driv- ing two 75 Ω back terminated loads. 750 750 75 CABLE 75 75 VOUT #1 VOUT #2 +VS –VS VIN 0.1 F 4.7 F 1/2 AD8002 0.1 F 4.7 F 75 CABLE 75 75 75 CABLE 75 75 VOUT #3 VOUT #4 75 CABLE 75 75 1/2 AD8002 750 750 75 CABLE 75 + Figure 45. Video Line Driver |
Số phần tương tự - AD8002AN |
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Mô tả tương tự - AD8002AN |
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