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参数资料
| 型号： | LM4902LDX/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.675 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | LLP-8 |
| 文件页数： | 7/18页 |
| 文件大小： | 772K |
| 代理商： | LM4902LDX/NOPB |
Application Information (Continued)
R
F/Ri =AVD/2
(6)
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 =20 k. 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 = 20kHz x 5 = 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 LM4902 GBWP of
25MHz. This figure displays that if a designer has a need to
design an amplifier with a higher differential gain, the
LM4902 can still be used without running into bandwidth
problems.
LM4902
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4902MM | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| LM4902MM/NOPB | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| LM4903 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1 Watt Audio Power Amplifier |
| LM4903MM | 制造商:Texas Instruments 功能描述:AMP, AUDIO POWER 1.6W, SMD, LLP-28 |
| LM4903MM/NOPB | 功能描述:IC AMP AUDIO PWR 1.07W AB 8MSOP 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) |
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