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LM4872ITPX 参数 Datasheet PDF下载

LM4872ITPX图片预览
型号: LM4872ITPX
PDF下载: 下载PDF文件 查看货源
内容描述: [IC,AUDIO AMPLIFIER,SINGLE,BGA,8PIN,PLASTIC]
分类和应用: 放大器商用集成电路
文件页数/大小: 15 页 / 465 K
品牌: TI [ TEXAS INSTRUMENTS ]
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Application Information (Continued)  
10123024  
FIGURE 2. Higher Gain Audio Amplifier  
The LM4872 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 in that an incorrect  
combination of R3 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 R3  
=
20kand C4 = 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 implement a  
band limiting filter below 100kHZ.  
11  
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