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參數(shù)資料
| 型號： | LM4666 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 音頻放大器 |
| 英文描述： | Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier |
| 中文描述： | 濾波1.2W的立體聲高效率開關音頻放大器 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 642K |
| 代理商： | LM4666 |
Application Information
(Continued)
typical value. Increased THD may also be observed with
voltages less than V
DD
on the Shutdown pin when in PLAY
mode.
The LM4666 has an internal resistor connected between
GND and Shutdown pins. The purpose of this resistor is to
eliminate any unwanted state changes when the Shutdown
pin is floating. The LM4666 will enter the shutdown state
when the Shutdown pin is left floating or if not floating, when
the shutdown voltage has crossed the threshold. To mini-
mize the supply current while in the shutdown state, the
Shutdown pin should be driven to GND or left floating. If the
Shutdown pin is not driven to GND, the amount of additional
resistor current due to the internal shutdown resistor can be
found by Equation (1) below.
(V
SD
- GND) / 60k
(1)
With only a 0.5V difference, an additional 8.3μA of current
will be drawn while in the shutdown state.
GAIN SELECTION FUNCTION
The LM4666 has fixed selectable gain to minimize external
components, increase flexibility and simplify design. For a
differential gain of 6dB, the Gain Select pin should be per-
manently connected to V
DD
or driven to a logic high level.
For a differential gain of 12dB, the Gain Select pin should be
permanently connected to GND or driven to a logic low level.
The gain of the LM4666 can be switched while the amplifier
is in PLAY mode driving a load with a signal without damage
to the IC. The voltage on the Gain Select pin should be
switched quickly between GND (logic low) and V
DD
(logic
high) to eliminate any possible audible artifacts from appear-
ing at the output. For typical threshold voltages for the Gain
Select function, refer to the Gain Threshold Voltages graph
in the
Typical Performance Characteristics
section.
L
www.national.com
11
相關PDF資料 |
PDF描述 |
|---|---|
| LM4666SD | Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier |
| LM4666SDA | Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier |
| LM4668 | 10W High-Efficiency Mono BTL Audio Power Amplifier |
| LM4668LD | 10W High-Efficiency Mono BTL Audio Power Amplifier |
| LM4668MH | 10W High-Efficiency Mono BTL Audio Power Amplifier |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM4666SD | 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4666SD/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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4666SDA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier |
| LM4666SDBD | 功能描述:音頻 IC 開發(fā)工具 LM4666SD 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 |
| LM4666SDBD/NOPB | 功能描述:音頻 IC 開發(fā)工具 LM4666 Eval Brd 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 |
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