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LM4917MTNSN/a336avaiLM4917 Ground-Referenced, 95mW Stereo Headphone Amplifier
LM4917SDNSN/a27904avaiLM4917 Ground-Referenced, 95mW Stereo Headphone Amplifier


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LM4917MT-LM4917SD
LM4917 Ground-Referenced, 95mW Stereo Headphone Amplifier
LM4917
Ground-Referenced, 95mW Stereo Headphone Amplifier
General Description

The LM4917isa stereo, output capacitor-less headphone
amplifier capableof delivering 95mWof continuous average
power intoa 16Ω load with less than 1% THD+N froma
single3V power supply.
The LM4917 provides high quality audio reproduction with
minimal external components.A ground referenced output
eliminates the output coupling capacitors typically required single-ended loads, reducing component count, cost and
board space consumption. This makesthe LM4917 idealfor
mobile phones and other portable equipment where board
spaceisata premium. Eliminating the output coupling ca-
pacitors also improves low frequency response.
The LM4917 operates froma single 1.4Vto 3.6V power
supply, features low 0.02% THD+N and 70dB PSRR. Inde-
pendent right/left channel low-power shutdown controls pro-
vide power saving flexibilityfor mono/stereo applications.
Superior click and pop suppression eliminates audible tran-
sients during startup and shutdown. Short circuit and ther-
mal overload protection protectsthe device during fault con-
ditions.
Key Specifications
Improved PSRRat 1kHz 70dB (typ) Power Outputat VDD= 3V, =16Ω, THD%1% 95mW (typ) Shutdown Current 0.01µA (typ)
Features
Ground referenced outputs High PSRR Availablein space-saving TSSOP package Ultra low current shutdown mode Improved pop& click circuitry eliminates noises during
turn-on and turn-off transitions 1.4– 3.6V operation No output coupling capacitors, snubber networks,
bootstrap capacitors Shutdown either channel independently
Applications
Notebook PCs Desktop PCs Mobile Phone PDAs Portable electronic devices
Block Diagram

200893B8
FIGURE1. Circuit Block Diagram

November 2004
LM4917
Ground-Referenced,
95mW
Stereo
Headphone
Amplifier
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