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LM48820 PDF预览

LM48820

更新时间: 2024-11-04 05:42:23
品牌 Logo 应用领域
美国国家半导体 - NSC 放大器
页数 文件大小 规格书
16页 930K
描述
Ground-Referenced, Ultra Low Noise, Fixed Gain, 95mW Stereo Headphone Amplifier

LM48820 数据手册

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June 2007  
LM48820  
Ground-Referenced, Ultra Low Noise, Fixed Gain, 95mW  
Stereo Headphone Amplifier  
General Description  
Key Specifications  
The LM48820 is a ground referenced, fixed-gain audio power  
amplifier capable of delivering 95mW of continuous average  
power into a 16single-ended load, with less than 1% THD  
+N from a 3V power supply.  
■ꢀImproved PSRR at 217Hz  
■ꢀPower Output at VDD = 3V,  
RL = 16Ω, THD+N = 1%  
80dB (typ)  
95mW (typ)  
0.05µA (typ)  
1.5V/V (typ)  
1.6V to 4.5V  
The LM48820 features a new circuit technology that utilizes  
a charge pump to generate a negative reference voltage. This  
allows the outputs to be biased about ground, thereby elimi-  
nating output-coupling capacitors typically used with normal  
single-ended loads.  
■ꢀShutdown Current  
■ꢀInternal Fixed Gain  
■ꢀWide Operating Voltage Range  
Boomer audio power amplifiers were designed specifically to  
provide high quality output power with a minimal number of  
external components. The LM48820 does not require output  
coupling capacitors or bootstrap capacitors, and therefore is  
ideally suited for mobile phone and other portable applica-  
tions.  
Features  
Available in space saving 0.4mm pitch micro SMD  
package  
Fixed Logic Levels  
Ground referenced outputs  
High PSRR  
The LM48820 features a low-power consumption shutdown  
mode selectable for each channel and a soft start function that  
reduces start-up current transients. Additionally, the  
LM48820 features an internal thermal shutdown protection  
mechanism.  
Ultra low current shutdown mode  
Improved pop & click circuitry eliminates noises during  
turn-on and turn-off transitions  
No output coupling capacitors, snubber networks,  
bootstrap capacitors, or gain-setting resistors required  
Shutdown either channel independently  
The LM48820 contains advanced pop & click circuitry that  
eliminates noises which would otherwise occur during turn-on  
and turn-off transitions.  
Soft start feature reduces start up transient current  
The LM48820 has an internal fixed gain of 1.5V/V.  
Applications  
Mobile Phones  
MP3 Players  
PDAs  
Portable electronic devices  
Notebook PCs  
Boomer® is a registered trademark of National Semiconductor Corporation.  
© 2007 National Semiconductor Corporation  
202023  
www.national.com  

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