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參數資料
| 型號： | LM4868MT |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function |
| 中文描述： | 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-20 |
| 文件頁數： | 19/28頁 |
| 文件大小： | 792K |
| 代理商： | LM4868MT |
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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
and C
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/(2
π
R
i
f
L
)
(14)
The result is
1/(2
π
*
20k
*
20Hz) = 0.397μF
(15)
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
VD
, determines the
upper passband response limit. With A
= 3 and f
=
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
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
L
www.national.com
19
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM4868MT/NOPB | 功能描述:IC AMP AUDIO PWR 3W AB 20TSSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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 通道數量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4868MTE | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function |
| LM4868MTE/NOPB | 功能描述:IC AMP AUDIO PWR 3W AB 20TSSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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 通道數量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4869 | 制造商:NSC 制造商全稱: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 制造商全稱:National Semiconductor 功能描述:1.9W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown |
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