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OPA363IDBVR Datasheet(PDF) 11 Page - Texas Instruments |
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OPA363IDBVR Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 27 page ![]() OPA363, 2363, 364, 2364, 4364 SBOS259B 11 www.ti.com ACTIVE FILTERING Low harmonic distortion and noise specifications plus high gain and slew rate make the OPA363 and OPA364 optimal candidates for active filtering. Figure 11 shows the OPA2363 configured as a low-distortion, 3rd-order GIC (General Immit- tance Converter) filter. Figure 12 shows the implementation of a Sallen-Key, 3-pole, low-pass Bessel filter. FIGURE 11. The OPA2363 as a 3rd-Order, 40kHz, Low-Pass GIC Filter. FIGURE 10. Microphone Preamplifier. FIGURE 12. The OPA363 or OPA364 Configured as a 3-Pole, 20kHz, Sallen-Key Filter. R 11 3.92k Ω R 12 3.92k Ω C 13 1000pF R 14 3.48k Ω C 15 1000pF V OUT V IN R 1 3.92k Ω R 3 1.33k Ω C 4 1000pF 1/2 OPA2363 1/2 OPA2363 3 2 1 6 5 7 2 3 6 OPA363 3.3V 49k Ω V OUT OPAx363 OPAx364 Clean 3.3V Supply 1 µF 4k Ω 6k Ω Electret Microphone 5k Ω V OUT V IN = 1Vrms OPA363 150k Ω 19.5k Ω 220pF 1.8k Ω 3.3nF 47pF |
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