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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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AD712AQ Arkusz danych(PDF) 17 Page - Analog Devices |
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AD712AQ Arkusz danych(HTML) 17 Page - Analog Devices |
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17 / 20 page  AD712 Rev. G | Page 17 of 20 FILTERS ACTIVE FILTER APPLICATIONS In active filter applications using op amps, the dc accuracy of the amplifier is critical to optimal filter performance. The amplifier offset voltage and bias current contribute to output error. Offset voltage is passed by the filter and can be amplified to produce excessive output offset. For low frequency applications requiring large value input resistors, bias currents flowing through these resistors also generate an offset voltage. In addition, at higher frequencies, the op amp dynamics must be carefully considered. Here, slew rate, bandwidth, and open- loop gain play a major role in op amp selection. The slew rate must be fast as well as symmetrical to minimize distortion. The amplifier bandwidth in conjunction with the filter gain dictates the frequency response of the filter. The use of a high performance amplifier such as the AD712 minimizes both dc and ac errors in all active filter applications. SECOND-ORDER LOW-PASS FILTER Figure 48 depicts the AD712 configured as a second-order, Butterworth low-pass filter. With the values as shown, the corner frequency is 20 kHz; however, the wide bandwidth of the AD712 permits a corner frequency as high as several hundred kilohertz. Equations for component selection are as follows: R1 = R2 = A user selected value (10 kΩ to 100 kΩ, typical) C1 (in farads) = () ()()1 2 414 . 1 R f cutoff π () ()()1 2 707 . 0 2 R f C cutoff π = +15V 1/2 AD712 0.1µF 0.1µF –15V VOUT VIN C1 560pF R2 20kΩ R1 20kΩ C2 280pF + – Figure 48. Second-Order Low-Pass Filter An important property of filters is their out-of-band rejection. The simple 20 kHz low-pass filter shown in Figure 48, can be used to condition a signal contaminated with clock pulses or sampling glitches that have considerable energy content at high frequencies. The low output impedance and high bandwidth of the AD712 minimize high frequency feedthrough as shown in Figure 49. The upper trace is that of another low cost BiFET op amp showing 17 dB more feedthrough at 5 MHz. REF 20.0 dBm 10dB/DIV RANGE 15.0dBm OFFSET .0 Hz 0dB CENTER 5 000 000.0Hz RBW 30kHz SPAN 10 000 000.0Hz ST .8 SEC VBW 30kHz TYPICAL BIFET AD712 Figure 49. High Frequency Feedthrough |
Podobny numer części - AD712AQ |
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Podobny opis - AD712AQ |
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