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參數資料
| 型號： | LM4845 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Output Capacitor-less Audio Subsystem with Programmable National 3D |
| 中文描述： | 輸出電容器的音頻子系統，具有可編程全國三維 |
| 文件頁數： | 1/29頁 |
| 文件大小： | 1392K |
| 代理商： | LM4845 |
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LM4845
Output Capacitor-less Audio Subsystem with
Programmable National 3D
General Description
The LM4845 is an audio power amplifier capable of deliver-
ing 500mW of continuous average power into a mono 8
bridged-tied load (BTL) with 1% THD+N, 25mW per channel
of continuous average power into stereo 32
single-ended
(SE) loads with 1% THD+N, or an output capacitor-less
(OCL) configuration with identical specification as the SE
configuration, from a 3.3V power supply.
The LM4845 features a 32-step digital volume control and
eight distinct output modes. The digital volume control, 3D
enhancement, and output modes (mono/SE/OCL) are pro-
grammed through a two-wire I
2
C or a three-wire SPI com-
patible interface that allows flexibility in routing and mixing
audio channels. The LM4845 has three input channels: one
pair for a two-channel stereo signal and the third for a
single-channel mono input.
The LM4845 is designed for cellular phone, PDA, and other
portable handheld applications. It delivers high quality output
power from a surface-mount package and requires only
seven external components in the OCL mode (two additional
components in SE mode).
Key Specifications
j
THD+N at 1kHz, 500mW
into 8
BTL (3.3V)
j
THD+N at 1kHz, 25mW
into 32
SE (3.3V)
j
Single Supply Operation (V
DD
)
j
I
2
C/SPI Single Supply Operation
1.0% (typ)
1.0% (typ)
2.7 to 5.5V
2.2 to 5.5V
Features
n
I
2
C/SPI Control Interface
n
I
2
C/SPI programmable National 3D Audio
n
I
2
C/SPI controlled 32 step digital volume control (-54dB
to +18dB)
n
Three independent volume channels (Left, Right, Mono)
n
Eight distinct output modes
n
microSMD surface mount packaging
n
“Click and Pop” suppression circuitry
n
Thermal shutdown protection
n
Low shutdown current (0.1uA, typ)
Applications
n
Moblie Phones
n
PDAs
Boomer
is a registered trademark of National Semiconductor Corporation.
March 2005
L
2005 National Semiconductor Corporation
DS201059
www.national.com
相關PDF資料 |
PDF描述 |
|---|---|
| LM4845ITL | Output Capacitor-less Audio Subsystem with Programmable National 3D |
| LM4850 | Mono 1.5 W / Stereo 300 mW Power Amplifier |
| LM4850LD | Mono 1.5 W / Stereo 300 mW Power Amplifier |
| LM4850MM | Mono 1.5 W / Stereo 300 mW Power Amplifier |
| LM4850MT | Mono 1.5 W / Stereo 300 mW Power Amplifier |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM4845ITL | 制造商:Texas Instruments 功能描述:Audio Amp Headphone/Speaker 1-CH Mono/2-CH Stereo 1.15W Class-AB 25-Pin uSMD T/R |
| LM4845ITL/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 |
| LM4845ITLX/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 |
| LM4846 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Output Capacitor-less Audio Subsystem with Programmable National 3D |
| LM4846TL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Output Capacitor-less Audio Subsystem with Programmable National 3D |
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