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LM4868

National Semiconductor
Part Number LM4868
Manufacturer National Semiconductor
Description Dual 2.1W Audio Amplifier
Published Mar 22, 2005
Detailed Description LM4868 Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function August 2002...
Datasheet PDF File LM4868 PDF File

LM4868
LM4868

Overview
LM4868 Output-Transient-Free Dual 2.
1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function August 2002 LM4868 Output-Transient-Free Dual 2.
1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function General Description The LM4868 is a dual bridge-connected audio power amplifier which, when connected to a 5V supply, will deliver 2.
1W to a 4Ω load (Note 1) or 2.
4W to a 3Ω load (Note 2) with less than 1.
0% THD+N.
The LM4868 uses advanced, latest generation circuitry to eliminate all traces of clicks and pops when the supply voltage is first applied.
The amplifier has a headphone-amplifier-select input pin.
It is used to switch the amplifiers from bridge to single-ended mode for driving headphones.
A new circuit topology eliminates headphone output coupling capacitors (patent pending).
A MUX control pin allows selection between the two sets of stereo input signals.
The MUX control can also be used to select between two different customer-specified closed-loop responses.
Boomer audio power amplifiers are designed specifically to provide high quality output power from a surface mount package and require few external components.
To simplify audio system design, the LM4868 combines dual bridge speaker amplifiers and stereo headphone amplifiers in one package.
The LM4868 features an externally controlled power-saving micropower shutdown mode, a stereo headphone amplifier mode, and thermal shutdown protection.
Note 1: An LM4868LQ or LM4868MTE that has been properly mounted to a circuit board will deliver 2.
1W into 4Ω.
The Mux control can also be used to select two different closed-loop responses.
LM4868MT will deliver 1.
1W into 8Ω.
See the Application Information sections for further information concerning the LM4868LQ and the LM4868MT.
Note 2: An LM4868LQ or LM4868MTE that has been properly mounted to a circuit board and forced-air cooled will deliver 2.
4W into 3Ω.
Key Specifications n PO at 1% THD+N n LM4868LQ, 3Ω load 2.
4W (typ) n LM4868LQ, ...


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