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TLV2780 数据表(PDF) 14 Page - Texas Instruments |
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TLV2780 数据表(HTML) 14 Page - Texas Instruments |
14 / 26 page TLV2780, TLV2781, TLV2782, TLV2783, TLV2784, TLV2785, TLV278xA FAMILY OF 1.8 V HIGHSPEED RAILTORAIL INPUT/OUTPUT OPERATIONAL AMPLIFIERS WITH SHUTDOWN SLOS245E − MARCH 2000 − REVISED JANUARY 2005 14 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 32). VI VO C1 + − RG RF R1 f –3dB + 1 2 pR1C1 V O V I + 1 ) R F R G 1 1 ) 2pfR1C1 Figure 32. 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 33. 2-Pole Low-Pass Sallen-Key Filter |
类似零件编号 - TLV2780 |
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类似说明 - TLV2780 |
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