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LM4867MTE Datasheet

  • LM4867MTE

  • Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coup...

  • 765.94KB

  • 26頁(yè)

  • NSC

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LM4867 Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo
Headphone Function
February 2001
LM4867
Output-Transient-Free Dual 2.1W Audio Amplifier Plus
No Coupling Capacitor Stereo Headphone Function
General Description
The LM4867 is a dual bridge-connected audio power ampli-
fier which, when connected to a 5V supply, will deliver 2.1W
to a 4鈩?load (Note 1) or 2.4W to a 3鈩?load (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. A MUX control pin allows selec-
tion 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 LM4867 combines dual bridge
speaker amplifiers and stereo headphone amplifiers in one
package.
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鈩? The Mux control can also be used to
select two different closed-loop responses. LM4867MT will deliver 1.1W into
8鈩? See the Application Information sections for further information concern-
ing the LM4867LQ and the LM4867MT.
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鈩?
Key Specifications
n
P
O
at 1% THD+N
n
LM4867LQ, 3鈩?load
2.4W (typ)
n
LM4867LQ, 4鈩?load
2.1W (typ)
n
LM4867MTE, 4鈩?/div>
1.9W (typ)
n
LM4867MT, 8鈩?/div>
1.1W (typ)
n
Single-ended mode - THD+N at 75mW into 32鈩?/div>
0.5%
(max)
n
Shutdown current
0.7碌A(chǔ) (typ)
Features
n
Advanced 鈥渃lick and pop鈥?suppression circuitry
n
Eliminates headphone amplifier output coupling
capacitors
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
Typical Application
DS200013-31
*
Refer to the Application Information section titled PROPER SELECTION OF EXTERNAL COMPONENTS for details concerning the value of C
B
.
FIGURE 1. Typical Audio Amplifier Application Circuit
(Pin out shown for the 24-pin Exposed-DAP LLP package. Numbers in ( ) are for the 20-pin MTE and MT
packages.)
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2001 National Semiconductor Corporation
DS200013
www.national.com

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