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參數(shù)資料
| 型號(hào)： | LM4877IBPX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 5 psi, Gage, Cell with body o-ring, 10 Vdc excitation |
| 中文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| 封裝： | MICRO, MO-211-BC, SMD-8 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 427K |
| 代理商： | LM4877IBPX |
Application Information
(Continued)
HIGHER GAIN AUDIO AMPLIFIER
The LM4877 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 feed-
back 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 R
3
and C
4
will cause rolloff before 20kHz. A
typical combination of feedback resistor and capacitor that
will not produce audio band high frequency rolloff is R
=
20k
and C
= 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.
DS101290-24
Figure 2
L
www.national.com
10
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