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參數(shù)資料
| 型號(hào)： | LA49032H |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| 封裝： | 0.375 INCH, HSOP-36 |
| 文件頁(yè)數(shù)： | 3/12頁(yè) |
| 文件大小： | 809K |
| 代理商： | LA49032H |
20035824
FIGURE 2. Higher Gain Audio Amplifier
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 eliminates
possible high frequency oscillations. Care should be taken
when calculating the -3dB frequency in that an incorrect com-
bination of R
3 and C4 will cause rolloff before 20kHz. A typical
combination of feedback resistor and capacitor that will not
produce audio band high frequency rolloff is R
3 = 20k and
C
4 = 25pf. These components result in a -3dB point of ap-
proximately 320kHz.
11
www.national.com
LM4889
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