전자부품 데이터시트 검색엔진 |
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AD825AR-REEL7 데이터시트(PDF) 10 Page - Analog Devices |
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AD825AR-REEL7 데이터시트(HTML) 10 Page - Analog Devices |
10 / 11 page AD825 –10– REV. C Second Order Low-Pass Filter A second order Butterworth low-pass filter can be implemented using the AD825 as shown in Figure 28. The extremely low bias currents of the AD825 allow the use of large resistor values, and consequently small capacitor values, without concern for devel- oping large offset errors. Low current noise is another factor in permitting the use of large resistors without having to worry about the resultant voltage noise. With the values shown, the corner frequency will be 1 MHz. The equations for component selection are shown below. Note that the noninverting input (and the inverting input) has an input capacitance of 6 pF. As a result, the calculated value of C1 (12 pF) is reduced to 6 pF. C1 = 1.414 2 π f CUTOFF R1 C2( farads) = 0.707 2 π f CUTOFF R1 R1 = R2 = user selected typically10kΩ to100 kΩ () A plot of the filter frequency response is shown in Figure 29; better than 40 dB of high frequency rejection is provided. AD825 C3 0.1 F +5V C4 0.1 F VOUT VIN C2 6pF –5V C1 24pF R1 9.31k R2 9.31k Figure 28. Second Order Butterworth Low-Pass Filter FREQUENCY – Hz 10k 100M 100k 1M 10M 0 –10 –20 –30 –40 –50 –60 –70 –80 Figure 29. Frequency Response of Second Order Butterworth Filter |
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