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參數(shù)資料
| 型號： | LM4906GR/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA12 |
| 封裝： | MICRO ARRAY, LLP-12 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 888K |
| 代理商： | LM4906GR/NOPB |
Application Information (Continued)
C
i. A larger input coupling capacitor requires more charge to
reach its quiescent DC voltage (nominally 1/2 V
DD). This
charge comes from the output via the feedback and is apt to
create pops upon device enable. Thus, by minimizing the
capacitor size based on necessary low frequency response,
turn-on pops can be minimized.
AUDIO POWER AMPLIFIER DESIGN
A 1W/8
Audio Amplifier
Given:
Power Output
1 Wrms
Load Impedance
8
Input Level
1 Vrms
Input Impedance
20 k
Bandwidth
100 Hz–20 kHz ± 0.25 dB
A designer must first determine the minimum supply rail to
obtain the specified output power. By extrapolating from the
Output Power vs Supply Voltage graphs in the Typical Per-
formance Characteristics section, the supply rail can be
easily found.
Extra supply voltage creates headroom that allows the
LM4906 to reproduce peaks in excess of 1W without pro-
ducing audible distortion. At this time, the designer must
make sure that the power supply choice along with the
output impedance does not violate the conditions explained
in the Power Dissipation section.
The gain of the LM4906 is internally set at either 6dB or
12dB.
The final design step is to address the bandwidth require-
ments which must be stated as a pair of 3dB frequency
points. Five times away from a 3dB point is 0.17dB down
from passband response which is better than the required
±0.25dB specified.
f
L = 100Hz/5= 20Hz
f
H = 20kHz*5= 100kHz
As stated in the External Components section, R
in (20k) in
conjunction with C
2 create a highpass filter.
C
2
≥ 1/(2π*20k*20Hz) = 0.397F; use 0.39F
200571C0
FIGURE 2. REFERENCE DESIGN BOARD SCHEMATIC
LM4906
www.national.com
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| LM4908MA/NOPB | 0.157 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM4906LD | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1W, Bypass-Capacitor-less Audio Amplifier with Internal Selectable Gain |
| LM4906LD/NOPB | 功能描述:IC AMP AUDIO PWR 1W MONO 10LLP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)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(shù)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) |
| LM4906LDBD | 功能描述:音頻 IC 開發(fā)工具 LM4906LD EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| LM4906LDBD/NOPB | 制造商:Texas Instruments 功能描述:Evaluation Kit For 1W, Bypass-Capacitor-Less Audio Amplifier With Internal Selectable Gain |
| LM4906LDX | 功能描述:IC AMP AUDIO PWR 1W MONO 10LLP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)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(shù)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) |
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