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LM4889 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM4889 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 19 page  Application Information (Continued) The LM4889 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 (C4) may be needed as shown in Figure 2 to bandwidth limit the amplifier. This feedback capacitor creates a low pass filter that elimi- nates possible high frequency oscillations. Care should be taken when calculating the -3dB frequency in that an incor- rect combination of R 3 and C 4 will cause rolloff before 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 320kHz. 20035824 FIGURE 2. Higher Gain Audio Amplifier www.national.com 11 |
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