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LM4892M Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM4892M Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 22 page External Components Description (Figure 1) (Continued) Components Functional Description 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. 6. C OUT This output coupling capacitor blocks DC voltage while coupling the AC audio signal to the headphone speaker. Combined with R L, the headphone impedance, it creates a high pass filter at fc = 1/(2 πR LCOUT). Refer to the section, Proper Selection of External Components for an explanation of how to determine the value of C OUT. 7. R PU This is the pull up resistor to activate headphone operation when a headphone plug is plugged into the headphone jack. 8. R S This is the current limiting resistor for the headphone input pin. 9. R PD This is the pull down resistor to de-activate headphone operation when no headphone is plugged into the headphone jack. Typical Performance Characteristics THD+N vs Frequency at V DD = 5V, 8 Ω R L, and PWR = 250mW THD+N vs Frequency at V DD = 3.3V, 8 Ω R L, and PWR = 150mW 20012737 20012738 THD+N vs Frequency at V DD = 2.6V, 8 Ω R L, and PWR = 100mW THD+N vs Frequency at V DD = 2.6V, 4 Ω R L, and PWR = 100mW 20012739 20012740 www.national.com 5 |
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