Datenblatt-Suchmaschine für elektronische Bauteile |
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AD705JN Datenblatt(PDF) 8 Page - Analog Devices |
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AD705JN Datenblatt(HTML) 8 Page - Analog Devices |
8 / 8 page AD705 REV. B –8– A 1 Hz, 2-Pole, Active Filter Table II gives recommended component values for the 1 Hz fil- ter of Figure 26. An unusual characteristic of the AD705 is that both the input bias current and the input offset current and their drift remain low over most of the op amps rated temperature range. Therefore, for most applications, there is no need to use the normal balancing resistor tied between the noninverting ter- minal of the op amp and ground. Eliminating the standard bal- ancing resistor reduces board space and lowers circuit noise. However, this resistor is needed at temperatures above 110 °C, because input bias current starts to change rapidly, as shown by Figure 27. 6 4 0.1µF –VS 7 0.1µF +VS AD705 VOUT C1 C3 0.01µF R3 2M Ω R2 1M Ω C2 R1 1M Ω INPUT OPTIONAL BALANCE RESISTOR NETWORK WITHOUT THE NETWORK, PINS 2 AND 6 OF THE AD705 ARE TIED TOGETHER. CAPACITORS C1, C2 AND C3 ARE SOUTHERN ELECTRONICS MPCC, POLYCARBONATE, ±5%, 50 VOLT. 2 3 Figure 26. A 1 Hz, 2-Pole Active Filter Table II. Recommended Component Values for the 1 Hz Low-Pass Filter Desired Low Pole Pole Q C1 Value C2 Value Pass Response Frequency (Hz) ( F) ( F) Bessel Response 1.27 0.58 0.14 0.11 Butterworth Response 1.00 0.707 0.23 0.11 0.1 dB Chebychev 0.93 0.77 0.26 0.11 0.2 dB Chebychev 0.90 0.80 0.28 0.11 0.5 dB Chebychev 0.85 0.86 0.32 0.11 1.0 dB Chebychev 0.80 0.96 0.38 0.10 Specified values are for a –3 dB point of 1.0 Hz. For other frequencies, simply scale capacitors C1 and C2 directly; i.e., for 3 Hz Bessel response, C1 = 0.046 µF, C2 = 0.037 µF. 90 –90 +140 0 –60 –40 –30 –60 60 30 +120 +80 +60 +40 +100 +20 0 –20 TEMPERATURE – °C WITHOUT OPTIONAL BALANCE RESISTOR, R3 WITH OPTIONAL BALANCE RESISTOR, R3 Figure 27. VOS vs. Temperature of 1 Hz Filter 0.310 (7.87) 0.220 (5.59) 0.015 (0.38) 0.008 (0.20) 0.005 (0.13) MIN 0.055 (1.4) MAX 1 4 5 8 0.405 (10.29) MAX 0.200 (5.08) MAX SEATING PLANE 0.023 (0.58) 0.014 (0.36) 0.070 (1.78) 0.030 (0.76) 0.060 (1.52) 0.015 (0.38) 0.150 (3.81) MIN 0.200 (5.08) 0.125 (3.18) 0.100 (2.54) BSC 0.25R (0.64) 0-15 ° 0.32 (8.13) 0.29 (7.37) PIN 1 4 5 1 8 0.0500 (1.27) BSC 0.154 ± 0.004 (3.91 ± 0.10) 0.236 ± 0.012 (6.00 ± 0.20) 0.193 ± 0.008 (4.90 ± 0.10) 0.098 ± 0.006 (2.49 ± 0.23) 0.008 ± 0.004 (0.203 ± 0.075) 0.017 ± 0.003 (0.42 ± 0.07) 0.011 ± 0.002 (0.269 ± 0.03) 0.033 ± 0.017 (0.83 ± 0.43) PIN 1 0.25 (6.35) 4 5 8 1 SEATING PLANE 0.100 (2.54) TYP 0.31 (7.87) 0.39 (9.91) MAX 0.035 ± 0.01 (0.89 ± 0.25) 0.18 ± 0.03 (4.57 ± 0.76) 0.033 (0.84) NOM 0.018 ± 0.003 (0.46 ± 0.08) 0.125 (3.18) MIN 0.165 ± 0.01 (4.19 ± 0.25) 0.30 (7.62) REF 0.011 ± 0.003 (0.28 ± 0.08) 0-15 ° OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Cerdip (Q) Package Plastic Mini-DIP (N) Package 8-Pin SOIC (R) Package |
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Ähnliche Beschreibung - AD705JN |
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