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TLC080IPE4 数据表(PDF) 20 Page - Texas Instruments |
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TLC080IPE4 数据表(HTML) 20 Page - Texas Instruments |
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20 / 52 page ![]() TLC080, TLC081, TLC082, TLC083, TLC084, TLC085, TLC08xA FAMILY OF WIDEBANDWIDTH HIGHOUTPUT DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS SLOS254D − JUNE 1999 − REVISED FEBRUARY 2004 20 WWW.TI.COM APPLICATION INFORMATION general configurations When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is often required. The simplest way to accomplish this is to place an RC filter at the noninverting terminal of the amplifier (see Figure 50). VI VO C1 + − RG RF R1 f –3dB + 1 2 pR1C1 V O V I + 1 ) R F R G 1 1 ) sR1C1 Figure 50. Single-Pole Low-Pass Filter If even more attenuation is needed, a multiple pole filter is required. The Sallen-Key filter can be used for this task. For best results, the amplifier should have a bandwidth that is 8 to 10 times the filter frequency bandwidth. Failure to do this can result in phase shift of the amplifier. VI C2 R2 R1 C1 RF RG R1 = R2 = R C1 = C2 = C Q = Peaking Factor (Butterworth Q = 0.707) ( = 1 Q 2 − ) RG RF _ + f –3dB + 1 2 pRC Figure 51. 2-Pole Low-Pass Sallen-Key Filter |
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