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LM4840LQ Datasheet

  • LM4840LQ

  • National Semiconductor [Stereo 2W Audio Power Amplifiers wi...

  • 788.86KB

  • NSC

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LM4840 Stereo 2W Audio Power Amplifiers with Digital Volume Control and Input Mux
December 2001
LM4840
Stereo 2W Audio Power Amplifiers
with Digital Volume Control and Input Mux
General Description
The LM4840 is a monolithic integrated circuit that provides
digital volume control and stereo bridged audio power am-
plifiers capable of producing 2W into 4鈩?(Note 1) with less
than 1.0% THD or 2.2W into 3鈩?(Note 2) with less than 1.0%
THD.
Boomer
廬
audio integrated circuits were designed specifically
to provide high quality audio while requiring a minimum
amount of external components. The LM4840 incorporates a
digital volume control, stereo bridged audio power amplifiers,
an input mux, and a last volume level memory function to
save the volume setting during shutdown. These features
make it optimally suited for multimedia monitors, portable
radios, desktop, and portable computer applications.
The LM4840 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 LM4840LQ and
LM4840MH will deliver 2W into 4鈩? The LM4840MT will deliver 1.1W into 8鈩?
See the Application Information section LM4840LQ and for LM4840MH us-
age information.
Note 2:
An LM4840LQ and LM4840MH that have been properly mounted to
the circuit board and forced-air cooled will deliver 2.2W into 3鈩?
Key Specifications
n
P
O
at 1% THD+N
n
into 3鈩?(LM4840LQ, LM4840MH)
2.2W (typ)
n
into 4鈩?(LM4840LQ, LM4840MH)
2.0W (typ)
n
into 8鈩?(LM4840)
1.1W (typ)
n
Single-ended mode - THD+N at 85mW into 32鈩?/div>
1.0%
(typ)
n
Shutdown current
0.2碌A(chǔ) (typ)
Features
n
n
n
n
n
n
n
n
n
PC98 and PC99 Compliant
Digital Volume Control Interface
System Beep Detect
Stereo switchable bridged/single-ended power amplifiers
鈥淐lick and pop鈥?suppression circuitry
Thermal shutdown protection circuitry
Input Mux
Capless headphone drivers
Last volume memory from shutdown
Applications
n
Portable and Desktop Computers
n
Multimedia Monitors
n
Portable Radios, PDAs, and Portable TVs
Connection Diagram
LLP Package
DS200104-35
Top View
Order Number LM4840LQ
See NS Package Number LQA028A for Exposed-DAP LLP
Boomer
廬
is a registered trademark of NationalSemiconductor Corporation.
漏 2001 National Semiconductor Corporation
DS200104
www.national.com

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