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LM4835 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain | |||
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March 1999
LM4835
Stereo 2W Audio Power Amplifiers
with DC Volume Control and Selectable Gain
General Description
The LM4835 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 LM4835 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 LM4835 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 LM4835MTE will
deliver 2W into 4â¦. The LM4835MT will deliver 1.1W into 8â¦. See the Appli-
cation Information section for LM4835MTE usage information.
Note 2: An LM4835MTE which has 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
into 3⦠(LM4835MTE)
into 4⦠(LM4835MTE)
into 8⦠(LM4835)
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 PC98 Compliant
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
configurable
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
Connection Diagram
TSSOP Package
DS100139-1
FIGURE 1. LM4835 Block Diagram
DS100139-2
Top View
Order Number LM4835MT
See NS Package Number MTC28 for TSSOP
Order Number LM4835MTE
See NS Package Number MXA28A for Exposed DAP
TSSOP
Boomer® is a registered trademark of NationalSemiconductor Corporation.
© 1999 National Semiconductor Corporation DS100139
www.national.com
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