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音频功率放大器
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产品名称:
音频功率放大器
产品型号:
LM4890
产品展商:
上海图一实业有限公司
关注指数:4881
产品文档:
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LM4890是低成本音频功率放大器，LM4890支持多声道和立体声，LM4890拥有1W功率的放大能力。LM4890适用于移动电话和其他内置扬声器的便携式音频设备。LM4890能够为8Ω负载提供1W功率的稳定输出，5V电源供电的条件下其总谐波失真和噪声不超过1%。LM4890采用桥接负载结构在提供高品质音频功率放大的同时，大大减少了外部元件数，无需外接输出耦合电容和自举电容。LM4890内置待机电路，当SHUTDOWN管脚接低电平时，整个电路工作在待机模式，待机电流不超过100nA。LN4890内置了杂音消除电路，可以消除芯片启动和关断过程中的咔嗒声或噼噗声。还可以通过外接电阻来调节增益。
音频功率放大器
的详细介绍
Low-Cost, Mono/Stereo,
1 W Differential Audio Power Amplifiers
■ General Description
The LM4890 is an audio power amplifier primarily designed for
demanding applications in
mobile phones and other portable communication device applications.
It is capable of delivering 1
watt of continuous average power to an 8Ω BTL load with less than
1% distortion (THD+N) from a
5V DC power supply.
Boomer audio power amplifiers were designed specifically to provide
high quality output
power with a minimal amount of external components. The LM4890 does
not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and
other low voltage applications where minimal power consumption is a
primary requirement.
The LM4890 features a low-power consumption shutdown mode, which is
achieved by
driving the shutdown pin with logic low. Additionally, the LM4890
features an internal thermal
shutdown protection mechanism.
The LM4890 contains advanced pop & click circuitry which
eliminates noises which would
otherwise occur during turn-on and turn-off transitions.
The LM4890 is unity-gain stable and can be configured by external
gain-setting resistors.
■ Key Specifications
l PSRR at 217Hz, VDD = 5V (Fig. 1) 62dB(typ.)
l Power Output at 5.0V & 1% THD 1W(typ.)
l Power Output at 3.3V & 1% THD 400mW(typ.)
l Shutdown Current 0.1μA(typ.)
■ Features
l Available in space-saving packages: micro SMD, MSOP,SOIC,
and LLP
l Ultra low current shutdown mode
l BTL output can drive capacitive loads
l Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
l 2.2 - 5.5V operation
l No output coupling capacitors, snubber networks or
bootstrap capacitors required
l Thermal shutdown protection
l Unity-gain stable
l External gain configuration capability
■ Applications
l Mobile Phones
l PDAs
l Portable electronic devices