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LM4811LD-LM4811LDX-LM4811MM-LM4811MMX
LM4811 Dual 105mW Headphone Amplifier with Digital Volume Control and Shutdown Mode
LM4811
Dual 105mW Headphone Amplifier with Digital V olume
Control and Shutdown Mode
General DescriptionThe LM4811isa dual audio power amplifier capableof
delivering 105mWper channelof continuous average power
intoa 16Ω load with 0.1% (THD+N) froma5V power supply.
Boomer audio power amplifiers were designed specificallyto
provide high quality output power witha minimal amountof
external components. Since the LM4811 does not require
bootstrap capacitorsor snubber networks,itis optimally
suitedfor low-power portable systems.
The LM4811 featuresa digital volume control that sets the
amplifier’s gain from +12dBto −33dBin16 discrete steps
usinga two−wire interface.
The unity-gain stable LM4811 also featuresan externally
controlled, active-high, micropower consumption shutdown
mode.It also hasan internal thermal shutdown protection
mechanism.
Key Specifications THD+Nat 1kHz, 105mW continuous average output
power into 16Ω 0.1% (typ) THD+Nat 1kHz, 70mW continuous average power into
32Ω 0.1% (typ) Shutdown Current 0.3µA (typ)
Features Digital volume control range from +12dBto −33dB LD and MSOP surface mount packaging "Click and Pop" suppression circuitry No bootstrap capacitors required Low shutdown current
Applications Cellular Phones MP3, CD, DVD players PDA’s Portable electronics
Connection Diagrams
MSOP PackageTop View
Order Number LM4811MM
See NS Package Number MUB10A Package
Top View
Order Number LM4811LD
See NS Package Number LDA10A
December 2002
LM481
Dual
105mW
Headphone
Amplifier
with
Digital
olume
Control
and
Shutdown
Mode
