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AD704AN Datasheet(PDF) 9 Page - Analog Devices |
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AD704AN Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page REV. C AD704 –9– The 1 Hz, 4-pole active filter offers dc precision with a minimum of components and cost. The low current noise, IOS, and IB allow the use of 1 M Ω resistors without sacrificing the 1 µV/°C drift of the AD704. This means lower capacitor values may be used, reducing cost and space. Furthermore, since the AD704’s IB is as low as its IOS, over most of the MIL temperature range, most applications do not require the use of the normal balancing resistor (with its stability capacitor). Adding the optional balancing resistor enhances performance at high temperatures, as shown in Figure 5. Table II gives capacitor values for several common low pass responses. 180 120 60 0 –60 –120 –180 –40 0 +40 +80 +120 TEMPERATURE – C WITHOUT OPTIONAL BALANCE RESISTOR, R3 WITH OPTIONAL BALANCE RESISTOR, R3 Figure 5. VOS vs. Temperature Performance of the 1 Hz Filter Circuit Table II. 1 Hz, 4-Pole Low-Pass Filter Recommended Component Values Section 1 Section 2 Desired Low Frequency Frequency C1 C2 C3 C4 Pass Response (Hz) Q (Hz) Q ( F) ( F) ( F) ( F) Bessel 1.43 0.522 1.60 0.806 0.116 0.107 0.160 0.0616 Butterworth 1.00 0.541 1.00 1.31 0.172 0.147 0.416 0.0609 0.1 dB Chebychev 0.648 0.619 0.948 2.18 0.304 0.198 0.733 0.0385 0.2 dB Chebychev 0.603 0.646 0.941 2.44 0.341 0.204 0.823 0.0347 0.5 dB Chebychev 0.540 0.705 0.932 2.94 0.416 0.209 1.00 0.0290 1.0 dB Chebychev 0.492 0.785 0.925 3.56 0.508 0.206 1.23 0.0242 Specified values are for a –3 dB point of 1.0 Hz. For other frequencies, simply scale capacitors C1 through C4 directly; i.e., for 3 Hz Bessel response, C1 = 0.0387 µF, C2 = 0.0357 µF, C3 = 0.0533 µF, C4 = 0.0205 µF. |
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