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LM4878 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM4878 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 16 page Application Information (Continued) The LM4878 is unity-gain stable and requires no external components besides gain-setting resistors, an input coupling capacitor, and proper supply bypassing in the typical appli- cation. However, if a closed-loop differential gain of greater than 10 is required, a feedback capacitor may be needed as shown in Figure 2 to bandwidth limit the amplifier. This feedback capacitor creates a low pass filter that eliminates possible high frequency oscillations. Care should be taken when calculating the -3dB frequency. An incorrect combina- tion of R 3 and C4 can cause a frequency roll off below 20kHz. A typical combination of feedback resistor and ca- pacitor that will not produce audio band high frequency rolloff is R 3 = 20k Ω and C 4 = 25pf. These components result in a -3dB point of approximately 320 kHz. It is not recommended that the feedback resistor and capacitor be used to imple- ment a band limiting filter below 100kHZ. 10136024 FIGURE 2. Higher Gain Audio Amplifier www.national.com 11 |
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