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参数资料
| 型号： | LM4891MX/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 4/23页 |
| 文件大小： | 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
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| LM4892IBP | 功能描述:IC AMP AUDIO PWR 1W MONO 8USMD RoHS:否 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Boomer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR) |
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