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参数资料
| 型号： | LM4874MH/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| 封装： | TSSOP-20 |
| 文件页数： | 10/21页 |
| 文件大小： | 869K |
| 代理商： | LM4874MH/NOPB |
Application Information (Continued)
As mentioned in the External Components section, the inter-
nal input resistor and C
i create a high pass filter that sets the
amplifier’s lower bandpass frequency limit. Find the coupling
capacitor’s value using Equation (11).
f
-3dB = 1/2
π(20k)C
I
(11)
The result is (using the minimum R
IN resistor value to ensure
correct magnitude response at 20Hz)
1/(2
π*20k*20Hz) = 0.398F
(12)
Use a 0.39F capacitor, the closest standard value. The
product of the desired high frequency cutoff (100kHz in this
example) and the differential gain, A
VD, determines the up-
per passband response limit. With A
VD = 3.2 and fH =
100kHz, the closed-loop gain bandwidth product (GBWP) is
320kHz. This is less than the LM4874’s 3.5MHz GBWP. With
this margin, the amplifier can be used in designs that require
more differential gain while avoiding performance-restricting
bandwidth limitations.
Recommended Printed Circuit
Board Layout
Figures 2 through 6 show the recommended four-layer PC
board layout that is optimized for the 20-pin MH-packaged
LM4874 and associated external components. This circuit is
designed for use with an external 5V supply and 3
(or
higher) speakers (or load resistors).
This circuit board is easy to use. Apply 5V and ground to the
board’s V
DD
and GND terminals, respectively. Connect
speakers (or load resistors) between the board’s -OUTA and
+OUTA and -OUTB and +OUTB pads. Apply balanced dif-
ferential stereo input signals to the input pins labeled ’-INA,’
’+INA,’ ’-INB,’ and ’+INB.’
200469D7
FIGURE 2. Recommended MH PC Board Layout:
Component-Side Silkscreen
200469D8
FIGURE 3. Recommended MH PC Board Layout:
Component-Side Layout
LM4874
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4875 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch |
| LM4875M | 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 |
| LM4875M/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 |
| LM4875MM | 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 |
| LM4875MM/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 |
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