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AD825ARZ-161 Datasheet(PDF) 11 Page - Analog Devices |
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AD825ARZ-161 Datasheet(HTML) 11 Page - Analog Devices |
11 / 12 page AD825 Rev. F | Page 11 of 12 SECOND-ORDER LOW-PASS FILTER A second-order Butterworth low-pass filter can be implemented using the AD825 as shown in Figure 33. The extremely low bias currents of the AD825 allow the use of large resistor values and, consequently, small capacitor values without concern for developing 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. R1 f C1 CUTOFF π = 2 414 . 1 () R1 f farads C2 CUTOFF π = 2 707 . 0 ( ) Ω k 100 Ω k 10 to Typically Selected User R2 R1 = = A plot of the filter frequency response is shown in Figure 34; better than 40 dB of high frequency rejection is provided. AD825 C3 0.1 µF C4 0.1 µF VOUT VIN C2 6pF –5V C1 24pF R1 9.31k Ω R2 9.31k Ω +5V Figure 33. Second-Order Butterworth Low-Pass Filter FREQUENCY (Hz) 10k 100M 100k 1M 10M 0 –10 –20 –30 –40 –50 –60 –70 –80 Figure 34. Frequency Response of Second-Order Butterworth Filter |
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