參數(shù)資料
型號(hào)： LM4891MX/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 音頻／視頻放大
英文描述： 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
封裝： SOIC-8
文件頁(yè)數(shù)： 4/23頁(yè)
文件大?。?/td> 674K
代理商： LM4891MX/NOPB
Application Information (Continued)
must make sure that the power supply choice along with the
output impedance does not violate the conditions explained
in the Power Dissipation section.
Once the power dissipation equations have been addressed,
the required differential gain can be determined from Equa-
tion 3.
(3)
A
VD =(Rf/Ri)2
From Equation 3, the minimum A
VD is 2.83; use AVD =3.
Since the desired input impedance was 20 k
, and with a
A
VD of 3, a ratio of 1.5:1 of Rf to Ri results in an allocation of
R
i =20k and Rf =30k. 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
3 dB point is 0.17 dB down from passband response which
is better than the required ±0.25 dB specified.
f
L = 100 Hz/5 = 20 Hz
f
H =20kHz*5=100 kHz
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) = 0.397 F; use 0.39 F
The high frequency pole is determined by the product of the
desired frequency pole, f
H, and the differential gain, AVD.
With a A
VD = 3 and fH = 100 kHz, the resulting GBWP =
300 kHz which is much smaller than the LM4891 GBWP of
2.5 MHz. This figure displays that if a designer has a need to
design an amplifier with a higher differential gain, the
LM4891 can still be used without running into bandwidth
limitations.
LM4891
www.national.com
12
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