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LM4938MH Folha de dados(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM4938MH
Descrição Electrónicos  Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4938MH Folha de dados(HTML) 1 Page - National Semiconductor (TI)

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LM4938
Stereo 2W Audio Power Amplifiers
with DC Volume Control and Selectable Gain
General Description
The LM4938 is a monolithic integrated circuit that provides
DC volume control, and stereo bridged audio power amplifi-
ers capable of producing 2W into 4
Ω (Note 1) with less than
1.0% THD or 2.2W into 3
Ω (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 LM4938 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 LM4938 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, LM4938MH will deliver
2W into 4
Ω. See Application Information section Exposed-DAP package
PCB Mounting Considerations for more information.
Note 2: An LM4938MH that has been properly mounted to the circuit board
and forced-air cooled will deliver 2.2W into 3
Ω.
Key Specifications
n
P
O at 1% THD+N
n
into 3
2.2W (typ)
n
into 4
2.0W (typ)
n
into 8
1.3W (typ)
n
Single-ended mode - THD+N at 92mW into
32
1.0%(typ)
n
Shutdown current
0.5µA (typ)
Features
n
Improved click and pop circuitry virtually eliminates
noise during turn on/off transitions
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
Thermal shutdown protection circuitry
n
Unity gain stable
Applications
n
Flat Panel Displays
n
Portable and Desktop Computers
n
Multimedia Monitors
n
Portable Radios, PDAs, and Portable TVs
Block Diagram
Boomer® is a registered trademark of NationalSemiconductor Corporation.
20095601
FIGURE 1. LM4938 Block Diagram
February 2005
© 2005 National Semiconductor Corporation
DS200956
www.national.com


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