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参数资料
| 型号： | LM4880MDA |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.325 W, 2 CHANNEL, AUDIO AMPLIFIER, UUC |
| 封装： | DIE |
| 文件页数： | 2/15页 |
| 文件大小： | 418K |
| 代理商： | LM4880MDA |
Application Information (Continued)
(4)
A
V =RF/Ri
(5)
From
Equation (4), the minimum gain is::
A
V = 1.26
Since the desired input impedance was 20 k
, and with a
gain of 1.26, a value of 27 k
is designated for R
f, assum-
ing 5% tolerance resistors. This combination results in a
nominal gain of 1.35. 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 assuming a single
pole roll-off. As stated in the External Components section,
both R
i in conjunction with Ci, and Co with RL, create first or-
der high pass filters. Thus to obtain the desired frequency
low response of 100 Hz within ± 0.5 dB, both poles must be
taken into consideration. The combination of two single order
filters at the same frequency forms a second order response.
This results in a signal which is down 0.34 dB at five times
away from the single order filter 3 dB point. Thus, a fre-
quency of 20 Hz is used in the following equations to ensure
that the response if better than 0.5 dB down at 100 Hz.
C
i ≥ 1/(2π*20k*20Hz) = 0.397 F; use 0.39 F
C
o ≥ 1/(2π*8*20Hz) = 995 F; use 1000 F
The high frequency pole is determined by the product of the
desired high frequency pole, f
H, and the closed-loop gain,
A
V. With a closed-loop gain magnitude of 1.35 and fH = 100
kHz, the resulting GBWP = 135 kHz which is much smaller
than the LM4880 GBWP of 12.5 MHz. This figure displays
that if a designer has a need top design an amplifier with a
higher gain, the LM4880 can still be used without running
into bandwidth limitations.
LM4880
www.national.com
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相关代理商/技术参数 |
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| LM4880MX | 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 |
| LM4880MX/NOPB | 功能描述:音频放大器 Dual 200 mW Audio Pwr Amp 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 |
| LM4880N | 功能描述:IC AMP AUDIO PWR .325W STER 8DIP 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) |
| LM4880-SH2-R | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:DUAL 250mW AUDIO POWER AMPLIFIER WITH SHUTDOWN MODE |
| LM4880-SH2-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:DUAL 250mW AUDIO POWER AMPLIFIER WITH SHUTDOWN MODE |
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