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LM2904W Folha de dados(PDF) 11 Page - STMicroelectronics |
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LM2904W Folha de dados(HTML) 11 Page - STMicroelectronics |
11 / 19 page LM2904W Electrical characteristics 11/19 Typical single-supply applications Figure 19. AC coupled inverting amplifier Figure 20. AC coupled non-inverting amplifier 1/2 LM2904 ~ 0 2VPP R 10k Ω L Co eo R 6.2k Ω B R 100k Ω f R1 10k Ω CI eI VCC R2 100k Ω C1 10 μF R3 100k Ω A= - R R1 V f (as shown A = -10) V 1/2 LM2904 ~ 0 2VPP R 10k Ω L Co eo R 6.2k Ω B C1 0.1μF eI V CC (as shown A = 11) V A= 1 + R2 R1 V R1 100k Ω R2 1M Ω CI R3 1M Ω R4 100k Ω R5 100k Ω C2 10μF Figure 21. Non-inverting DC gain Figure 22. DC summing amplifier R1 10k Ω R2 1M Ω 1/2 LM2904 10k Ω e I e O +5V (mV) 0 AV=1 + R2 R1 (As shown = 101) A V 1/2 LM2904 e O e 4 e 3 e 2 e 1 100k Ω 100k Ω 100k Ω 100k Ω 100k Ω 100k Ω eo = e1 + e2 - e3 - e4 where (e1 + e2) (e3 + e4) to keep eo 0V ≥ ≥ Figure 23. High input Z, DC differential amplifier Figure 24. Using symmetrical amplifiers to reduce input current + 1/2 LM2904 R1 100k Ω R2 100k Ω R4 100k Ω R3 100k Ω +V2 V1 Vo 1/2 LM2904 If R1 = R5 and R3 = R4 = R6 = R7 eo = [ 1 + ] (e2 - e1) As shown eo = 101 (e2 - e1) 2R1 R2 I B 2N 929 0.001 μF I B 3M Ω I B eo I I e I I B I B Input current compensation 1.5M Ω 1/2 LM2904 1/2 LM2904 |
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