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TLV2381IDBVR Datasheet(PDF) 9 Page - Texas Instruments |
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TLV2381IDBVR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 12 page TLV2381 TLV2382 SLOS377A – SEPTEMBER 2001– REVISED JULY 2003 9 www.ti.com APPLICATION INFORMATION offset voltage The output offset voltage (VOO) is the sum of the input offset voltage (VIO) and both input bias currents (IIB) times the corresponding gains. The following schematic and formula can be used to calculate the output offset voltage: V OO + V IO 1 ) R F R G " I IB ) R S 1 ) R F R G " I IB– R F + – VI + RG RS RF IIB– VO IIB+ Figure 25. Output Offset Voltage Model 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 26). VI VO C1 + – RG RF R1 f –3dB + 1 2 pR1C1 V O V I + 1 ) R F R G 1 1 ) sR1C1 VDD/2 Figure 26. 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 VDD/2 Figure 27. 2-Pole Low-Pass Sallen-Key Filter |
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