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LM4868 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4868 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 28 page  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 ampli- fier which, when connected to a 5V supply, will deliver 2.1W toa4 Ω load (Note 1) or 2.4W to a 3Ω load (Note 2) with less than 1.0% THD+N. The LM4868 uses advanced, latest gen- eration 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 be- tween two different customer-specified closed-loop re- sponses. 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 4 Ω. The Mux control can also be used to select two different closed-loop responses. LM4868MT will deliver 1.1W into 8 Ω. See the Application Information sections for further information concern- ing 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 3 Ω. Key Specifications n P O at 1% THD+N n LM4868LQ, 3 Ω load 2.4W (typ) n LM4868LQ, 4 Ω load 2.1W (typ) n LM4868MTE, 4 Ω 1.9W (typ) n LM4868MT, 8 Ω 1.1W (typ) n Single-ended mode - THD+N at 75mW into 32 Ω 0.5% (max) n Shutdown current 0.7µA (typ) Features n Advanced “click and pop” suppression circuitry n Eliminates headphone amplifier output coupling capacitors (patent pending) n Stereo headphone amplifier mode n Input mux control and two separate inputs per channel n Thermal shutdown protection circuitry n LLP, TSSOP, and exposed-DAP TSSOP packaging available Applications n Multimedia monitors n Portable and desktop computers n Portable audio systems Connection Diagrams 20026758 Top View Order Number LM4868MT, LM4868MTE See NS Package Number MTC20 for TSSOP See NS Package Number MXA20A for Exposed-DAP TSSOP Boomer® is a registered trademark of National Semiconductor Corporation. August 2002 © 2002 National Semiconductor Corporation DS200267 www.national.com |
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