LM4838MTE

Manufacturer Part NumberLM4838MTE
ManufacturerNational Semiconductor
LM4838MTE datasheets
 


Specifications of LM4838MTE

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LM4838
Stereo 2W Audio Power Amplifiers
with DC Volume Control and Selectable Gain
General Description
The LM4838 is a monolithic integrated circuit that provides
DC volume control, and stereo bridged audio power amplifi-
ers capable of producing 2W into 4Ω (Note 1) with less than
1.0% THD or 2.2W into 3Ω (Note 2) with less than 1.0%
THD.
Boomer
®
audio integrated circuits were designed specifically
to provide high quality audio while requiring a minimum
amount of external components. The LM4838 incorporates a
DC volume control, stereo bridged audio power amplifiers
and a selectable gain or bass boost, making it optimally
suited for multimedia monitors, portable radios, desktop, and
portable computer applications.
The LM4838 features an externally controlled, low-power
consumption shutdown mode, and both a power amplifier
and headphone mute for maximum system flexibility and
performance.
Note 1: When properly mounted to the circuit board, the LM4838LQ and
LM4838MTE will deliver 2W into 4Ω. The LM4838MT and LM4838ITL will
deliver 1.1W into 8Ω. See Application Information section Exposed-DAP
package PCB Mounting Considerations for more information.
Note 2: An LM4838LQ and LM4838MTE that have been properly mounted
to the circuit board and forced-air cooled will deliver 2.2W into 3Ω.
Block Diagram
Boomer
®
is a registered trademark of NationalSemiconductor Corporation.
© 2003 National Semiconductor Corporation
Key Specifications
n P
at 1% THD+N
O
into 3Ω (LQ & MTE)
n
into 4Ω (LQ & MTE)
n
into 8Ω (MT, MTE, ITL, & LQ)
n
n Single-ended mode - THD+N at 85mW into
32Ω
n Shutdown current
Features
n DC Volume Control Interface
n System Beep Detect
n Stereo switchable bridged/single-ended power amplifiers
n Selectable internal/external gain and bass boost
n “Click and pop” suppression circuitry
n Thermal shutdown protection circuitry
Applications
n Portable and Desktop Computers
n Multimedia Monitors
n Portable Radios, PDAs, and Portable TVs
FIGURE 1. LM4838 Block Diagram
DS200133
January 2003
2.2W (typ)
2.0W (typ)
1.1W (typ)
1.0%(typ)
0.7µA (typ)
20013301
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