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AD826ARZ 数据表(PDF) 11 Page - Analog Devices |
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AD826ARZ 数据表(HTML) 11 Page - Analog Devices |
11 / 15 page AD826 –11– SINGLE SUPPLY OPERATION An exciting feature of the AD826 is its ability to perform well in a single supply configuration (see Figure 37). The AD826 is ideally suited for applications that require low power dissipation and high output current and those which need to drive large capacitive loads, such as high speed buffering and instrumentation. Referring to Figure 36, careful consideration should be given to the proper selection of component values. The choices for this particular circuit are: (R1 + R3) R2 combine with C1 to form a low frequency corner of approximately 30 Hz. VS 1/2 AD826 R2 10k 3.3 F 0.01 F C3 0.1 F VOUT R1 9k R3 1k C2 0.1 F VIN C1 1 F CL 200pF RL 150 COUT Figure 36. Single Supply Amplifier Configuration R3 and C2 reduce the effect of the power supply changes on the output by low-pass filtering with a corner at 1 2 πR 3C2 . The values for RL and CL were chosen to demonstrate the AD826’s exceptional output drive capability. In this configura- tion, the output is centered around 2.5 V. In order to eliminate the static dc current associated with this level, C3 was inserted in series with RL. 10 90 100 0% 500mV 100ns 500mV Figure 37. Single Supply Pulse Response, G = +1, RL = 150 Ω, CL = 200 pF PARALLEL AMPS PROVIDE 100 mA TO LOAD By taking advantage of the superior matching characteristics of the AD826, enhanced performance can easily be achieved by employing the circuit in Figure 38. Here, two identical cells are paralleled to obtain even higher load driving capability than that of a single amplifier (100 mA min guaranteed). R1 and R2 are included to limit current flow between amplifier outputs that would arise in the presence of any residual mismatch. VS VIN VOUT 1k R1 5 R2 5 –VS 1k 1k 1k RL 1/2 AD826 1/2 AD826 0.1 F 1 F 0.1 F 1 F Figure 38. Parallel Amp Configuration REV. C |
类似零件编号 - AD826ARZ |
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类似说明 - AD826ARZ |
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