LM49120   
Audio Sub-System with Mono Class AB Loudspeaker Amplifier and Stereo OCL/SE Headphone Amplifier 		Click link to Download

Features
•RF immunity
•Selectable OCL/SE headphone drivers
•32 Step volume control
•Click and Pop suppression
•Independent speaker and headphone gain settings
•Minimum external components
•Thermal over load protection
•Micro-power shutdown
•Space saving 16–bump mciro SMD package
•Thermal shutdown protection
•Micro-power shutdown
•I 2C Control Interface

Description

The LM49120 is a compact audio subsystem designed for portable handheld applications such as cellular phones. The LM49120 combines a mono 1.3W speaker amplifier, stereo 85mW/ch output capacitorless headphone amplifier, 32 step volume control, and an input mixer/multiplexer into a single 16–bump micro SMD package.

The LM49120 has three input channels: two single-ended stereo inputs and a differential mono input. Each input features a 32-step digital volume control. The headphone output stage features an 8 step (-18dB – 0dB) attenuator, while the speaker output stage has two selectable (0dB/+6dB) gain settings. The digital volume control and mode control are programmed through a two-wire I 2C compatible interface.

Key Specification
■  Output power at VDD = 5V:  
 Speaker:    RL = 8Ω BTL, THD+N ≤ 1% 1.3W (typ)
 Headphone:    RL = 32Ω, SE, THD+N ≤ 1% 85mW (typ)
■  Output power at VDD = 3.6V:  
 Speaker:    RL = 8Ω, BTL, THD+N ≤ 1% 632mW (typ)
■  Output power at VDD = 3.3V:  
 Speaker:    RL = 8Ω, BTL, THD+N ≤ 1% 540mW (typ)
 Headphone:    RL = 32Ω, OCL/SE, THD+N ≤ 1% 35mW (typ)

Applications
•Mobile Phones
•PDAs
•Portable Electronics
Also Recommended
LM49151▲Class D With ALC, Ground Reference Headphone



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Typical Application
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Connection Diagram
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Typical Performance
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Paramaters / ValuesLM49120 LM49151
Power@ 8Ohms, 1% THD.54 Watt 1.25 Watt
THD0.015 % .02 %
PSRR83 dB 91 dB
Channels3 Channels
THD Conditionsf=1kHz, Pout = 12mW, RL=32ohms, SE or OCL HP out, mode 4 LS;f=1kHz ; Po =250mW
PSRR ConditionsVripple = 200mVpp, fripple=217Hz, RL=32ohms, Cb=2.2uF HP Mode 4, mono input
User Supply3.3 Volt 5 Volt
Audio MuxYes Yes
Capless HeadphoneYes Yes
ClassD DriverNo Yes
InterfaceI2C
Stereo Inputs1 1
National 3DNo No
Digital Volume Control Max18 dB 18 dB
Digital Volume Control Min-86 dB -80 dB
Output Modes24
Supply Range+1.4 - +3.6 V +1.4 - +3.6 V
Mono Inputs1 1
Temperature Min-40 deg C -40 deg C
Temperature Max85 deg C 85 deg C
Loudspeaker TypeClass AB Class D
Headphone TypeVirtual Ground True Ground
AutomotiveNo
Loudspeaker Outputs1 1

Datasheet
TitleSizeDateOther
Language
LM49120   Audio Sub-System with Mono Class AB Loudspeaker Amplifier and Stereo OCL/SE Headphone Amplifier730
Kbytes		16-Jul-08 


Featured Application Notes
TitleSizeDateOther
Language
AN-1622: Application Note 1622 LM49100 Evaluation Board User's Guide1237
Kbytes		19-Oct-07 


More Application Notes
TitleSizeDateOther
Language
AN-1622: Application Note 1622 LM49100 Evaluation Board User's Guide1237
Kbytes		19-Oct-07 

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM49120TL/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide499
$1.25 each at 1K+ pcsreel
of
250
LM49120TLX/NOPB

RoHS

Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.25 each at 1K+ pcsreel
of
3000

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM49120TLEVAL
LM49120 Evaluation BoardFull production


 
DistributorRegionQty
NATIONALWorldwide0
CALLN/A

Description:

The LM49120 is an integrated mono subsystem with Class AB speaker or earpiece amplifier and output capacitorless headphone amplifier in a 16-bump micro SMD package. The LM49120 is designed to meet the demands of mobile phones and other portable communication devices. It is capable of delivering 1.3W of average power into an 8 ohm load and 85 milliwatts of average power to a 32 ohm load with less than 1% distortion (THD+N) from a 5V DC power supply.

The LM49120TLEVAL is an evaluation board designed to ease evaluation and effort during the development of a circuit using the LM49120TL. The evaluation board comes with an I2C card and cable. It is an easy-to-use stand-alone board that requires power and GND, an I2C control signal, an input signal and an output load. Software for the product can be downloaded from http://audio.national.com

Features:

  • Tiny micro SMD package
  • Optimized function set for portable devices
  • High output power (1.3W into 8ohms at 5V)
  • 0.05% THD+N at 250mW for speaker output
  • 0.015% THD+N at 12mW for headphone outputs

Applications:

  • Mobile phones
  • Portable Navigation Devices
  • PMPs
  • Portable device

Contents:

  • Fully Assembled LM49120TL Evaluation Board
  • I2C interface card and cable
  • Instructions for where to locate and download the datasheet

Please note: Go to http://audio.national.com for more information on using the LM49120TL evaluation kit.


Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM49120TL/NOPB
MICRO SMD161260RoHSN/AN/A
XYTT
I GK2
LM49120TLX/NOPB
MICRO SMD161260RoHSN/AN/A
XYTT
I GK2

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM49120TLCMOS70184060010890004309006723
LM49120TLXCMOS70184060010890004309006723

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


[Information as of 21-Nov-2009]