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參數(shù)資料
| 型號： | LM4890IBPX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 Watt Audio Power Amplifier |
| 中文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| 封裝： | MICRO, SMD-8 |
| 文件頁數(shù)： | 20/31頁 |
| 文件大?。?/td> | 1208K |
| 代理商： | LM4890IBPX |
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Application Information
(Continued)
As stated in the
External Components
section, R
IN
in con-
junction with C
IN
create a highpass filter.
C
IN
≥
1/(2
π
*20 k
*20Hz) = 0.397μF; use 0.39μF
The high frequency pole is determined by the product of the
desired frequency pole, f
H
, and the differential gain, A
VD
.
With a A
= 3 and f
= 100kHz, the resulting GBWP =
300kHz which is much smaller than the LM4890 GBWP of
2.5MHz. This calculation shows that if a designer has a need
to design an amplifier with a higher differential gain, the
LM4890 can still be used without running into bandwidth
limitations.
The LM4890 is unity-gain stable and requires no external
components besides gain-setting resistors, an input coupling
capacitor, and proper supply bypassing in the typical appli-
cation. However, if a closed-loop differential gain of greater
than 10 is required, a feedback capacitor (C4) may be
needed as shown in
Figure 2
to bandwidth limit the amplifier.
This feedback capacitor creates a low pass filter that elimi-
nates possible high frequency oscillations. Care should be
taken when calculating the -3dB frequency in that an incor-
rect combination of R
and C
will cause rolloff before
20kHz. A typical combination of feedback resistor and ca-
pacitor that will not produce audio band high frequency rolloff
is R
= 20k
and C
= 25pf. These components result in a
-3dB point of approximately 320 kHz.
HIGHER GAIN AUDIO AMPLIFIER
20019224
FIGURE 2.
L
www.national.com
20
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| LM4893ITL | 1.1 Watt Audio Power Amplifier |
| LM4893ITLX | 1.1 Watt Audio Power Amplifier |
| LM4893MA | 1.1 Watt Audio Power Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4890ITL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1 Watt Audio Power Amplifier |
| LM4890ITL/NOPB | 功能描述:IC AMP AUDIO PWR 1W MONO 9USMD 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) |
| LM4890ITLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1 Watt Audio Power Amplifier |
| LM4890ITLX/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 |
| LM4890ITP | 制造商:Texas Instruments 功能描述:AMP AUDIO CELLULAR 1W SMD 4890 |
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