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LM2904 Scheda tecnica(PDF) 11 Page - STMicroelectronics |
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LM2904 Scheda tecnica(HTML) 11 Page - STMicroelectronics |
11 / 24 page LM2904, LM2904A Electrical characteristics Doc ID 2471 Rev 14 11/24 3.1 Typical single-supply applications Figure 18. AC coupled inverting amplifier Figure 19. AC coupled non-inverting amplifier 1/2 LM2904 ~ 0 2VPP R 10 k Ω L Co eo R 6.2 k Ω B R 100 k Ω f R1 10 k Ω CI eI VCC R2 100 k Ω C1 10 μF R3 100 k Ω A= - R R1 V f (as shown A = -10) V 1/2 LM2904 ~ 0 2VPP R 10 k Ω L Co eo R 6.2 k Ω B C1 0.1 μF eI V CC (as shown A = 11) V A= 1 + R2 R1 V R1 100 k Ω R2 1 M Ω CI R3 1 M Ω R4 100 k Ω R5 100 k Ω C2 10 μF Figure 20. Non-inverting DC gain Figure 21. DC summing amplifier R1 10 k Ω R2 1 M Ω 1/2 LM2904 10 k Ω e I e O +5V (mV) 0 AV=1 + R2 R1 (Asshown = 101) A V 1/2 LM2904 e O e 4 e 3 e 2 e 1 100 k Ω 100 k Ω 100 k Ω 100 k Ω 100 k Ω 100 k Ω eo = e1 + e2 - e3 - e4 where (e1 + e2) (e3 + e4) to keep eo 0V ≥ ≥ Figure 22. High input Z, DC differential amplifier Figure 23. Using symmetrical amplifiers to reduce input current + 1/2 LM2904 R1 100 k Ω R2 100 k Ω R4 100 k Ω R3 100 k 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 3 M Ω I B eo I I e I I B I B Inputcurrent compensation 1.5 M Ω 1/2 LM2904 1/2 LM2904 |
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