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参数资料
| 型号： | LM4894MWC |
| 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, UUC |
| 封装： | WAFER |
| 文件页数： | 6/21页 |
| 文件大小： | 781K |
| 代理商： | LM4894MWC |
Application Information (Continued)
duce peaks in excess of 1W without producing audible dis-
tortion. At this time, the designer must make sure that the
power supply choice along with the output impedance does
not violate the conditions explained in the Power Dissipa-
tion section. Once the power dissipation equations have
been addressed, the required differential gain can be deter-
mined from Equation 7.
(8)
R
f /Ri =AVD
From Equation 7, the minimum A
VD is 2.83. Since the de-
sired input impedance was 20k
, a ratio of 2.83:1 of R
f to Ri
results in an allocation of R
i = 20k
for both input resistors
and R
f= 60k
for both feedback resistors. The final design
step is to address the bandwidth requirement which must be
stated as a single -3dB frequency point. Five times away
from a -3dB point is 0.17dB down from passband response
which is better than the required ±0.25dB specified.
f
H = 20kHz * 5 =100kHz
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 = 2.83 and fH = 100kHz, the resulting GBWP =
150kHz which is much smaller than the LM4894 GBWP of
10MHz. This figure displays that if a designer has a need to
design an amplifier with a higher differential gain, the
LM4894 can still be used without running into bandwidth
limitations.
20013787
FIGURE 2. Single-Ended Input, ’Shutdown-Low’ Configuration
LM4894
www.national.com
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4895 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1 Watt Fully Differential Audio Power Amplifier With Shutdown Select and Fixed 6dB Gain |
| LM4895A E WAF | 制造商:Texas Instruments 功能描述: |
| LM4895IBP | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1 Watt Fully Differential Audio Power Amplifier With Shutdown Select and Fixed 6dB Gain |
| LM4895IBP/NOPB | 功能描述:IC AMP AUDIO PWR 1.4W MONO 9USMD RoHS:是 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) |
| LM4895IBPX | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
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