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参数资料
| 型号： | LM4868MTEX/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| 封装： | 6.50 X 4.40 MM, 0.90 MM HEIGHT, EXPOSED PAD, PLASTIC, TSSOP-20 |
| 文件页数： | 11/28页 |
| 文件大小： | 792K |
| 代理商： | LM4868MTEX/NOPB |
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Application Information (Continued)
f
L = 100Hz/5 = 20Hz
(12)
and an
f
H = 20kHz x 5 = 100kHz
(13)
As mentioned in the Selecting Proper External Compo-
nents section, R
i and Ci create a highpass filter that sets the
amplifier’s lower bandpass frequency limit. Find the coupling
capacitor’s value using Equation (12).
C
i
≥ 1/(2πR
ifL)
(14)
The result is
1/(2
π*20k*20Hz) = 0.397F
(15)
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
upper passband response limit. With A
VD = 3 and fH =
100kHz, the closed-loop gain bandwidth product (GBWP) is
300kHz. This is less than the LM4868’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 9 through 13 show the recommended four-layer PC
board layout that is optimized for the 24-pin LQ-packaged
LM4868 and associated external components. Figures 14
through 18 show the recommended four-layer PC board
layout that is optimized for the 24-pin MTE-packaged
LM4868 and associated external components. Figures 19
through 21 show the recommended two-layer PC board
layout that is optimized for the 20-pin MT-packaged LM4868
and associated external components. These circuits are de-
signed for use with an external 5V supply and 4
speakers
(or greater) for the MT-packaged LM4868 or 3
speakers (or
greater) for the LQ- and MTE-packaged LM4868.
These circuit boards are easy to use. Apply 5V and ground to
the board’s V
DD and GND pads, respectively. Connect 4
speakers between the board’s OUTA and +OUTA and
OUTB and +OUTB pads.
20026778
FIGURE 9. Recommended LQ PC Board Layout:
Component-Side Silkscreen
LM4868
www.national.com
19
相关PDF资料 |
PDF描述 |
|---|---|
| LM4868MT/NOPB | 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| LM4868MTX/NOPB | 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| LM4868LQ/NOPB | 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC24 |
| LM4868LQX/NOPB | 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC24 |
| LM4869MH/NOPB | 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4869 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1.9W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown |
| LM4869MH | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1.9W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown |
| LM4869MH/NOPB | 功能描述:IC AMP AUDIO PWR 2.6W AB 20TSSOP 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) |
| LM4870 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1.1W Audio Power Amplifier with Shutdown Mode |
| LM4870M | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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