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LM4838 Datasheet, PDF (1/36 Pages) National Semiconductor (TI) – Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain | |||
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January 2003
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 4⦠(Note 1) with less than
1.0% THD or 2.2W into 3⦠(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 4â¦. The LM4838MT and LM4838ITL will
deliver 1.1W into 8â¦. 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 3â¦.
Key Specifications
n PO at 1% THD+N
n into 3⦠(LQ & MTE)
n into 4⦠(LQ & MTE)
n into 8⦠(MT, MTE, ITL, & LQ)
n Single-ended mode - THD+N at 85mW into
32â¦
n Shutdown current
2.2W (typ)
2.0W (typ)
1.1W (typ)
1.0%(typ)
0.7µA (typ)
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 âClick and popâ suppression circuitry
n Thermal shutdown protection circuitry
Applications
n Portable and Desktop Computers
n Multimedia Monitors
n Portable Radios, PDAs, and Portable TVs
Block Diagram
FIGURE 1. LM4838 Block Diagram
Boomer® is a registered trademark of NationalSemiconductor Corporation.
© 2003 National Semiconductor Corporation DS200133
20013301
www.national.com
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