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LM4913MH Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LM4913MH Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 15 page External Components Description (Figure 1) Components Functional Description 1. R i This is the input resistor for the inverting input that, along with the 62.5k Ω internal feedback resistor R f, sets the first stage’s closed-loop gain. The overall SE gain is A V (SE) = 62.5k Ω /R i, whereas the overall BTL gain is A V (BTL) = -125k Ω /R i. Input resistance Ri and input capacitance Ci form a high pass filter. The ffilter’s cutoff frequency is filter’s cutoff frequency is f C =1/2 πR iCi. 2. C i This is the input coupling capacitor. It blocks DC voltage at the amplifier’s inverting input. C ii and Ri create a highpass filter. The filter’s cutoff frequency is f C =1/2 πR iCi. Refer to the Application Information section, SELECTING EXTERNAL COMPONENTS, for an explanation of determining C i’s value. 3. C C This is the output coupling capacitor. Refer to the Application Information section, SELECTING EXTERNAL COMPONENTS, for an explanation of determining CC’s value. 4. C S The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about properly placing, and selecting the value of this capacitor. 5. C B This capacitor filters the half-supply voltage present on the BYPASS pin. Refer to the Application Information section, SELECTING EXTERNAL COMPONENTS, for information about properly placing, and selecting the value of this capacitor. Typical Performance Characteristics Total Harmonic Distortion vs Output Power Total Harmonic Distortion vs Output Power 200617A3 200617B8 Total Harmonic Distortion + Noise vs Frequency Total Harmonic Distortion + Noise vs Frequency 200617A4 200617A5 www.national.com 6 |
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