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参数资料
| 型号： | LM4863MWC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, UUC |
| 封装： | WAFER |
| 文件页数： | 5/22页 |
| 文件大小： | 757K |
| 代理商： | LM4863MWC |
Application Information (Continued)
voltage must also not create a situation that violates maxi-
mum power dissipation as explained above in the Power
Dissipation section.
After satisfying the LM4863’s power dissipation require-
ments, the minimum differential gain is found using Equation
(10).
(10)
Thus, a minimum gain of 2.83 allows the LM4863’s to reach
full output swing and maintain low noise and THD+N perfor-
mance. For this example, let A
VD =3.
The amplifier’s overall gain is set using the input (R
i) and
feedback (R
f) resistors. With the desired input impedance
set at 20k
, the feedback resistor is found using Equation
(11).
R
f/Ri =AVD/2
(11)
The value of R
f is 30k.
The last step in this design example is setting the amplifier’s
3dB frequency bandwidth. To achieve the desired ±0.25dB
pass band magnitude variation limit, the low frequency re-
sponse must extend to at least onefifth the lower bandwidth
limit and the high frequency response must extend to at least
five times the upper bandwidth limit. The gain variation for
both response limits is 0.17dB, well within the ±0.25dB de-
sired limit. The results are an
f
L = 100Hz/5 = 20Hz
(12)
and an
F
H = 20kHzx5 = 100kHz
(13)
As mentioned in the External Components section, R
i
and C
i create a highpass filter that sets the amplifier’s lower
bandpass frequency limit. Find the coupling capacitor’s
value using Equation (14).
(14)
the result is
1/(2
π*20k*20Hz) = 0.398F
(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 LM4863’s 3.5MHz GBWP. With
this margin, the amplifier can be used in designs that require
more differential gain while avoiding performance-lrestricting
bandwidth limitations.
RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT
Figures 3 through 6 show the recommended two-layer PC
board layout that is optimized for the 20-pin MTE-packaged
LM4863 and associated external components. Figures 7
through 11 show the recommended four-layer PC board lay-
out that is optimized for the 24-pin LQ-packaged LM4863
and associated external components. These circuits are de-
signed for use with an external 5V supply and 4
speakers.
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.
DS012881-94
Figure 3. MTE PC board layout:
all layers superimposed
DS012881-93
Figure 4. MTE PC board layout:
Component-side Silkscreen
LM4863
www.national.com
13
相关PDF资料 |
PDF描述 |
|---|---|
| LM4863MX/NOPB | 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| LM4863MTEX/NOPB | 3.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| LM4863MTX/NOPB | 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| LM4863N/NOPB | 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDIP16 |
| LM4863LQX/NOPB | 3.2 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4863MX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Engineering Project Manager |
| LM4863MX/NOPB | 功能描述:IC AMP AUDIO PWR 3.2W AB 16SOIC 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) |
| LM4863N | 功能描述:IC AMP AUDIO PWR 3.2W STER 16DIP 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) |
| LM4864 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:300 mW Audio Power Amplifier with Shutdown Mode |
| LM4864LD/NOPB | 功能描述:IC AMP AUDIO PWR .725W AB 10LLP 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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