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LM4904 Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM4904 Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 18 page External Components Description (Figure 1) Components Functional Description 1. R i Inverting input resistance which sets the closed-loop gain in conjunction with R f. This resistor also forms a high pass filter with C i at fC= 1/(2 π R iCi). 2. C i Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a highpass filter with R i at fc = 1/(2 π R iCi). Refer to the section, Proper Selection of External Components, for an explanation of how to determine the value of C i. 3. R f Feedback resistance which sets the closed-loop gain in conjunction with R i. 4. C S Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing section for information concerning proper placement and selection of the supply bypass capacitor. 5. C B Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of External Components, for information concerning proper placement and selection of C B. Typical Performance Characteristics THD+N vs Frequency at V DD = 5V, 8 Ω R L, and PWR = 500mW THD+N vs Frequency at V DD = 3V, 8 Ω R L, and PWR = 250mW 20043730 20043731 THD+N vs Frequency at V DD = 2.6V, 8 Ω R L, and PWR = 150mW THD+N vs Frequency at V DD = 2.6V, 4 Ω R L, and PWR = 150mW 20043732 20043733 www.national.com 5 |
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