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LM4867_02 PDF预览

LM4867_02

更新时间: 2024-11-18 04:20:07
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美国国家半导体 - NSC 电容器放大器
页数 文件大小 规格书
28页 845K
描述
Output-Transient-Free Dual 2.1W Audop Amplifier Plus No Coupling Capacitor Stereo Headphone Function

LM4867_02 数据手册

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August 2002  
LM4867  
Output-Transient-Free Dual 2.1W Audio Amplifier Plus  
No Coupling Capacitor Stereo Headphone Function  
General Description  
Key Specifications  
n PO at 1% THD+N  
The LM4867 is a dual bridge-connected audio power ampli-  
fier which, when connected to a 5V supply, will deliver 2.1W  
to a 4load (Note 1) or 2.4W to a 3load (Note 2) with less  
than 1.0% THD+N. The LM4867 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.  
n
n
n
n
LM4867LQ, 3load  
LM4867LQ, 4load  
LM4867MTE, 4Ω  
LM4867MT, 8Ω  
2.4W (typ)  
2.1W (typ)  
1.9W (typ)  
1.1W (typ)  
n Single-ended mode - THD+N at 75mW into 32Ω  
(max)  
n Shutdown current  
0.5%  
0.7µA (typ)  
Features  
n Advanced “click and pop” suppression circuitry  
n Eliminates headphone amplifier output coupling  
capacitors (patent pending)  
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 LM4867 combines dual bridge  
speaker amplifiers and stereo headphone amplifiers in one  
package.  
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  
The LM4867 features an externally controlled power-saving  
micropower shutdown mode, a stereo headphone amplifier  
mode, and thermal shutdown protection.  
Note 1: An LM4867LQ or LM4867MTE that has been properly mounted to  
a circuit board will deliver 2.1W into 4. The Mux control can also be used to  
select two different closed-loop responses. LM4867MT will deliver 1.1W into  
8. See the Application Information sections for further information concern-  
ing the LM4867LQ and the LM4867MT.  
Applications  
n Multimedia monitors  
n Portable and desktop computers  
n Portable audio systems  
Note 2: An LM4867LQ or LM4867MTE that has been properly mounted to a  
circuit board and forced-air cooled will deliver 2.4W into 3.  
Connection Diagrams  
20001358  
Top View  
Order Number LM4867MT, LM4867MTE  
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.  
© 2004 National Semiconductor Corporation  
DS200013  
www.national.com  

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