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參數(shù)資料
| 型號： | LM4900M/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.675 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 7/17頁 |
| 文件大?。?/td> | 843K |
| 代理商： | LM4900M/NOPB |
Application Information (Continued)
From Equation 5, the minimum A
VD is 1.55; use AVD =2.
Since the desired input impedance was 20 k
, and with a
A
VD of 2, a ratio of 1:1 of RF to Ri results in an allocation of
R
i =RF =20k
. The final design step is to address the
bandwidth requirements which must be stated as a pair of
3 dB frequency points. Five times away from a pole gives
0.17 dB down from passband response which is better than
the required ±0.25 dB specified.
f
L = 100Hz/5 = 20Hz
f
H = 20kHzx5= 100kHz
As stated in the External Components section, R
i in con-
junction with C
i create a highpass filter.
C
i
≥ 1/(2π*20 k*20 Hz) = 0.397F; use 0.39F
The high frequency pole is determined by the product of the
desired high frequency pole, f
H, and the differential gain,
A
VD. With a AVD = 2 and fH = 100kHz, the resulting GBWP =
100kHz which is much smaller than the LM4900 GBWP of
25MHz. This figure displays that if a designer has a need to
design an amplifier with a higher differential gain, the
LM4900 can still be used without running into bandwidth
problems.
20006474
FIGURE 2. Differential Amplifier Configuration for LM4900
LM4900
www.national.com
15
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