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LM4840LQ-LM4840MH-LM4840MHX-LM4840MT
Stereo 2W Audio Power Amplifiers with Digital Volume Control and Input Mux
LM4840
Stereo 2W Audio Power Amplifiers
with Digital Volume Control and Input Mux
General DescriptionThe LM4840isa monolithic integrated circuit that provides
digital volume control and stereo bridged audio power am-
plifiers capableof producing 2W into4Ω (Note1) with less
than 1.0% THDor 2.2W into3Ω (Note2) with less than 1.0%
THD.
Boomer® audio integrated circuits were designed specifically provide high quality audio while requiringa minimum
amountof external components. The LM4840 incorporatesa
digital volume control, stereo bridged audio power amplifiers, input mux, anda last volume level memory functionto
save the volume setting during shutdown. These features
makeit optimally suitedfor multimedia monitors, portable
radios, desktop, and portable computer applications.
The LM4840 featuresan externally controlled, low-power
consumption shutdown mode, and botha power amplifier
and headphone mutefor maximum system flexibility and
performance.
Note1: When properly mountedtothe circuit board,the LM4840LQand
LM4840MH willdeliver2Winto 4Ω.TheLM4840MTwill deliver 1.1Winto8Ω.
Seethe Application Information section LM4840LQandfor LM4840MHus-
age information.
Note2:An LM4840LQand LM4840MHthat have been properly mountedto
the circuit boardand forced-air cooledwill deliver 2.2Winto3Ω.
Key Specifications POat 1% THD+N into3Ω (LM4840LQ, LM4840MH) 2.2W (typ) into4Ω (LM4840LQ, LM4840MH) 2.0W (typ) into8Ω (LM4840) 1.1W (typ) Single-ended mode- THD+Nat 85mW into 32Ω 1.0%
(typ) Shutdown current 0.2μA (typ)
Features PC98 and PC99 Compliant Digital Volume Control Interface System Beep Detect Stereo switchable bridged/single-ended power amplifiers “Click and pop” suppression circuitry Thermal shutdown protection circuitry Input Mux Capless headphone drivers Last volume memory from shutdown
Applications Portable and Desktop Computers Multimedia Monitors Portable Radios, PDAs, and Portable TVs
Connection Diagram
LLP PackageDS200104-35
Top View
Order Number LM4840LQ
See NS Package Number LQA028Afor Exposed-DAP LLPDecember 2001
LM4840
Stereo
Audio
Power
Amplifiers
with
Digital
olume
Control
and
Input
Mux
