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AD9617JR Arkusz danych(PDF) 9 Page - Analog Devices |
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AD9617JR Arkusz danych(HTML) 9 Page - Analog Devices |
9 / 10 page AD9617 –9– REV. B The effective noise at the output of the amplifier can be deter- mined by taking the root sum of the squares of Equation 11 and applying the spectral noise values found in the typical graph section. This applies to noise from the op amp only. Note that both the noise figure and equivalent input offset voltages im- prove as the closed loop gain is increased (by keeping RF fixed and reducing RI with RN = 0 Ω). CLI In 400 RSERIES RL 500 CL Figure 17. Capacitive Load Figure Capacitive Load Considerations Due to the low inverting input resistance (RS) and output buffer design, the AD9617 can directly handle input and/or output load capacitances of up to 20 pF. See the chart below. A small series resistor can be used at the output of the amplifier and outside of the feedback loop to facilitate driving larger ca- pacitive loads or for obtaining faster settling time. For capacitive loads above 20 pF, RSERIES should be considered. INPUT CAPACITANCE – CLI 5pF 4pF/DIV 25pF INPUT CAPACITANCE – CL 10pF 4pF/DIV 30pF RSERIES = 0 35 30 25 20 15 10 VOUT = 4V STEP CL = 0pF VOUT = 4V STEP CLI = 0pF Figure 18. Input/Output Capacitance Comparisons CL – pF 25 0 20 15 10 5 0 20 40 60 80 100 Figure 19. Recommended RSERIES vs. CL APPLYING THE AD9617 The superior frequency and time domain specifications of the AD9617 make it an obvious choice for driving flash converters and buffering the outputs of high speed DACs. Its outstanding distortion and noise performance make it well suited as a driver for analog to digital converters (ADCs) with resolutions as high as 16 bits. Typical circuits for inverting and noninverting applications are shown in Figures 20 and 21. Closed-loop gain for noninverting configurations is determined by the value of RI according to the equation: G = 1 + RF RI (12) 0.1 F 0.1 F 0.1 F 0.1 F 3.3 F 3.3 F –VS +VS AD9617 VOUT 400 RIN VIN RI Figure 20. Noninverting Operation 0.1 F 0.1 F 0.1 F 0.1 F 3.3 F 3.3 F –VS +VS AD9617 VOUT 400 RTERM VIN RI Figure 21. Inverting Operation |
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