音響ic、功放ic、atj2009b、功放芯片

2x2.5w 音響功放芯片支持立體聲耳機(jī)

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關(guān)于芯片介紹：

lm4863  dual 2.2w audio amplifier plus stereo headphone
function  general description
the lm4863 is a dual bridge-connected audio power amplifier
which, when connected to a 5v supply, will deliver 2.2w
to a 4ω load (note 1) or 2.5w to a 3ω load (note 2) with less
than 1.0% thd+n. in addition, the headphone input pin
allows the amplifiers to operate in single-ended mode when
driving stereo headphones.
boomer audio power amplifiers were designed specifically to
provide high quality output power from a surface mount
package while requiring few external components. to simplify
audio system design, the lm4863 combines dual bridge
speaker amplifiers and stereo headphone amplifiers on one
chip.
the lm4863 features an externally controlled, low-power
consumption shutdown mode, a stereo headphone amplifier
mode, and thermal shutdown protection. it also utilizes circuitry
to reduce “clicks and pops” during device turn-on.
note 1: an lm4863mte or lm4863lq that has been properly mounted to
a circuit board will deliver 2.2w into 4ω. the other package options for the
lm4863 will deliver 1.1w into 8ω. see the application information sections
for further information concerning the lm4863mte and lm4863lq.
note 2: an lm4863mte or lm4863lq that has been properly mounted to a
circuit board and forced-air cooled will deliver 2.5w into 3ω.
key specifications
1. po at 1% thd+n
2. lm4863lq, 3ω, 4ω loads 2.5w(typ), 2.2w(typ)
3. lm4863mte, 3ω, 4ω loads 2.5w(typ), 2.2w(typ)
4.lm4863mte, 8ω load 1.1w(typ)
5.lm4863, 8ω 1.1w(typ)
6. single-ended mode thd+n at 75mw into
32ω 0.5%(max)
7. shutdown current 0.7μa(typ)
8. supply voltage range 2.0v to 5.5v
features
9. stereo headphone amplifier mode
10.“click and pop” suppression circuitry
11. unity-gain stable
12. thermal shutdown protection circuitry
13. soic, tssop, exposed-dap tssop, and llp
packages
* not recommended for new designs. contact nsc audio
marketing.
applications
14. multimedia monitors
15. portable and desktop computers
16. portable televisions

概述
lm4863是一個雙橋式音頻功放ic。在5v工作電壓下，負(fù)載（4ω）上的平均功率為2.2w或負(fù)載（3ω）
上的平均功率為2.5w，且失真度不超過1.0％。另外，在運(yùn)行立體耳機(jī)模式時，耳機(jī)輸入端口允許放大器
工作在單端模式下。
lm4863是專為大功率、高保真的應(yīng)用場合所設(shè)計(jì)的音頻功放ic。所需外圍元件少且在2.0v～5.5v的
輸入電壓下均可工作。
功能特點(diǎn)
1. 立體耳機(jī)功放模式
2. 穩(wěn)定的增益輸出
3.熱關(guān)斷保護(hù)電路

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