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參數資料
| 型號： | LM4990 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level |
| 中文描述： | 2瓦特音頻功率放大器可選斷邏輯電平 |
| 文件頁數： | 15/19頁 |
| 文件大小： | 728K |
| 代理商： | LM4990 |
Application Information
(Continued)
The LM4990 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 320kHz.
20051024
FIGURE 2. HIGHER GAIN AUDIO AMPLIFIER
L
www.national.com
15
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM4990ITL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level |
| LM4990ITL/NOPB | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4990ITLBD | 功能描述:BOARD EVALUATION LM4990ITL RoHS:否 類別:編程器，開發(fā)系統 >> 評估板 - 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:1 系列:- |
| LM4990ITLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level |
| LM4990ITLX/NOPB | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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