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參數(shù)資料
| 型號： | LM4874 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 2.1W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown |
| 中文描述： | 2.1W差分輸入，BTL輸出立體聲音頻放大器可選增益和關(guān)機 |
| 文件頁數(shù)： | 18/21頁 |
| 文件大小： | 869K |
| 代理商： | LM4874 |
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
resistor value to ensure
correct magnitude response at 20Hz)
1/(2
π
*
20k
*
20Hz) = 0.398μF
(12)
Use a 0.39μF capacitor, the closest standard value. The
product of the desired high frequency cutoff (100kHz in this
example) and the differential gain, A
, determines the up-
per passband response limit. With A
= 3.2 and f
=
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
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
L
www.national.com
18
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM4874MH | 2.1W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown |
| LM4876 | 1.1W Audio Power Amplifier with Shutdown Logic Low |
| LM4876M | 1.1W Audio Power Amplifier with Shutdown Logic Low |
| LM4878IBP | 1 Watt Audio Power Amplifier in micro SMD package with Shutdown Logic Low |
| LM4878 | 1 Watt Audio Power Amplifier in micro SMD package with Shutdown Logic Low |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4874MH | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2.1W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown |
| LM4874MH/NOPB | 功能描述:IC AMP AUDIO PWR 2.6W AB 20TSSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風(fēng)，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4875 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch |
| LM4875M | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4875M/NOPB | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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