- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358867 > LM4890 (National Semiconductor Corporation) 1 Watt Audio Power Amplifier PDF資料下載
參數(shù)資料
| 型號： | LM4890 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 1 Watt Audio Power Amplifier |
| 中文描述： | 1瓦音頻功率放大器 |
| 文件頁數(shù)： | 20/31頁 |
| 文件大?。?/td> | 1208K |
| 代理商： | LM4890 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁當前第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM4893 | 1.1 Watt Audio Power Amplifier |
| LM4893ITL | 1.1 Watt Audio Power Amplifier |
| LM4893ITLX | 1.1 Watt Audio Power Amplifier |
| LM4893MA | 1.1 Watt Audio Power Amplifier |
| LM4893MM | 1.1 Watt Audio Power Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM48901 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Audio Power Amplifier Series |
| LM48901RL | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Audio Power Amplifier Series |
| LM48901RL/NOPB | 功能描述:音頻放大器 Quad Class D Spatial Array 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 |
| LM48901RLX | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Audio Power Amplifier Series |
| LM48901RLX/NOPB | 功能描述:音頻放大器 Quad Class D Spatial Array 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。