LM4917 - LM4917 Ground-Referenced, 95mW Stereo Headphone Amplifier
Datasheet Packaging Samples & Pricing Eval. Boards Knowledge Base

Features
•Ground referenced outputs
•High PSRR
•Available in 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

Key Specification

Improved PSRR at 1kHz 70dB (typ)
Power Output at VDD = 3V, RL = 16, THD <= 1%95mW (typ)
Shutdown Current0.01µA (typ)

General Description

The LM4917 is a stereo, output capacitor-less headphone amplifier capable of delivering 95mW of continuous average power into a 16 load with less than 1% THD+N from a single 3V power supply. More...


Applications

•Notebook PCs
•Desktop PCs
•Mobile Phone
•PDAs
•Portable electronic devices
  Typical Application
click for larger image


ParametersValues
Power@ 16Ohms, 1% THD 0.097 Watt
Power@ 32Ohms, 1% THD 0.082 Watt
Power@ 16Ohms, 10% THD 0.108 Watt
Power@ 32Ohms, 10% THD 0.108 Watt
THD 0.02 %
PSRR 70 dB
SNR 100 dB
Channels 2 Channels
THD Conditions Po=50mW, f=1kHz, Rl=32 Ohms
PSRR Conditions Vripple=200mW, f=1kHz
SNR Conditions RL=32 Ohms, Pout=20mW, f=1kHz
User Supply 3 Volt
Shutdown Type Independent Low
Supply Range +1.4 - +3.6 V
Temperature Min -40 deg C
Temperature Max 85 deg C


Typical Performance

click for larger image


  Block Diagram
*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM4917 Boomer ® Audio Power Amplifier Series Ground-Referenced, 95mW Stereo Headphone Amplifier 1208
Kbytes		 30-Nov-04 Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM4917SDBDLM4917 Ground-Referenced, 95mW Stereo Headphone AmplifierFull productionN/A
 
Buy Now 		1+$150.001-
6 weeksN/A
LM4917MTTSSOP14NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.90rail
of
94		NSZXYTT
L4917
MT
6 weeks500
LM4917MTXTSSOP14NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.90reel
of
2500		NSZXYTT
L4917
MT
6 weeks7500
LM4917SDLLP14NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.85reel
of
1000		ZXYTTE#
L4917
6 weeks2000
LM4917SDXLLP14RoHS Download Full productionN/A
 
Buy Now 		1K+$0.85reel
of
4500		ZXYTTE#
L4917
16 weeksN/A

General Description

The LM4917 is a stereo, output capacitor-less headphone amplifier capable of delivering 95mW of continuous average power into a 16 load with less than 1% THD+N from a single 3V power supply.

The LM4917 provides high quality audio reproduction with minimal external components. A ground referenced output eliminates the output coupling capacitors typically required by single-ended loads, reducing component count, cost and board space consumption. This makes the LM4917 ideal for mobile phones and other portable equipment where board space is at a premium. Eliminating the output coupling capacitors also improves low frequency response.

The LM4917 operates from a single 1.4V to 3.6V power supply, features low 0.02% THD+N and 70dB PSRR. Independent right/left channel low-power shutdown controls provide power saving flexibility for mono/stereo applications. Superior click and pop suppression eliminates audible transients during start up and shutdown. Short circuit and thermal overload protection protects the device during fault conditions.

[Information as of 8-Nov-2009]