National Semiconductor | High-performance Analog

 

 LM48824   

Class G Headphone Amplifier with I2C Volume Control
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Features

  • Class G Power Savings
  • Ground Referenced Headphone Outputs – Eliminates Output Coupling Capacitors
  • Common-Mode Sense
  • I 2C Volume and Mode Control
  • High Output Impedance in Shutdown
  • Differential Inputs
  • Advanced Click-and-Pop Suppression
  • Low Supply Current
  • Low THD mode option
  • Description

    The LM48824 is a Class G, ground-referenced stereo headphone amplifier designed for portable devices. The LM48824 features National’s ground-referenced architecture, which eliminates the large DC blocking capacitors required by traditional headphone amplifiers, saving board space and minimizing system cost.

    The LM48824 takes advantage of National’s patent-pending Class G architecture offering power savings compared to a traditional Class AB headphone amplifier. Additionally, output noise is improved by common-mode sensing that corrects for any differences between the amplifier ground and the potential at the headphone return terminal, minimizing noise created by any ground mismatches.

    A high output impedance mode allows the LM48824's outputs to be driven by an external source without degrading the signal. Other features include flexible power supply requirements, differential inputs for improved noise rejection, a low power (2.5μA) shutdown mode, and a 32-step I 2C volume control with mute function.

    The LM48824's superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM48824 is available in an ultra-small 16-bump, 0.4mm pitch micro SMD package (1.69mm x 1.69mm)

    Key Specification
    Quiescent Power Supply Current at 3.6V 0.9mA (typ)
    Output Power/channel at VDD = 3.6V   RL = 16Ω, THD+N 1% 37mW (typ)
    Output Power/channel at VDD = 3.6V   RL = 32Ω, THD+N 1% 29mW (typ)
    PSRR at 217Hz 100dB (typ)
    Shutdown current 2.5μA (typ)


    Applications

  • Mobile Phones, PDAs, MP3 Players
  • Portable Electronic Devices, Notebook PCs



  •  

    ParametersValues
    Supply Current 0.9 mA
    User Supply 3.6 Volt
    Power@ 16Ohms, 1% THD 0.037 Watt
    Power@ 32Ohms, 1% THD 0.029 Watt
    THD 0.02 %
    PSRR 100 dB
    SNR 102 dB
    Channels 2 Channels
    Shutdown Type I2C
    Supply Min 2.4 Volt
    Supply Max 5.5 Volt
    Volume Control 32 step I2C
    Exposed DAP No
    Output Configuration True Ground
    Special Features High Efficiency Class H
    Temperature Min -40 deg C
    Temperature Max 85 deg C
    Supply Range +2.4 - +5.5 V

    Datasheets
    TitleSizeDateOther
    Language
    LM48824 Class G Headphone Amplifier with I2C Volume Control1125
    Kbytes
    1-Sep-09   


    Other Technical Documents
    TitleTypeDate
    PowerWise® Class G versus Class AB Headphone AmplifiersSignal Path Designer 2009-06-11

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM48824TM/NOPB


    RoHS Status


    MICRO SMD
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide668
    MOUSERWorldwide750
    $1.06 each at 1K+ pcsreel
    of
    250
    LM48824TMX/NOPB


    RoHS Status


    MICRO SMD
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.06 each at 1K+ pcsreel
    of
    3000

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM48824.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM48824 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM48824TMEVAL
    LM48824TM Evaluation BoardFull production


     
    DistributorRegionQty
    CALLN/A

    Description:

    The LM48824 is a Class G, ground-referenced stereo headphone amplifier designed for portable devices. The LM48824 features National`s ground-referenced architecture, which eliminates the large DC blocking capacitors required by traditional headphone amplifiers, saving board space and minimizing system cost.

    The LM48824 takes advantage of National`s patent-pending Class G architecture offering power savings compared to a traditional Class AB headphone amplifier. Additionally, output noise is improved by common-mode sensing that corrects for any differences between the amplifier ground and the potential at the headphone return terminal, minimizing noise created by any ground mismatches.

    A high output impedance mode allows the LM48824`s outputs to be driven by an external source without degrading the signal. Other features include flexible power supply requirements, differential inputs for improved noise rejection, a low power (2.5µA) shutdown mode, and a 32-step I2C volume control with mute function.

    The LM48824s superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM48824 is available in an ultra-small 16-bump, 0.4mm pitch micro SMD package (1.69mm x 1.69mm)

    Features:

    • Class G Power Savings
    • Ground Referenced Headphone Outputs - Eliminates Output Coupling Capacitors
    • Common-Mode Sense
    • I2C Volume and Mode Control
    • High Output Impedance in Shutdown
    • Differential Inputs
    • Advanced Click-and-Pop Suppression
    • Low Supply Current
    • Low THD mode option

    Applications:

    • Mobile Phones, PDAs, MP3 Players
    • Portable Electronic Devices, Notebook PCs

    GUI Software:

    GUI Software for the LM48824 Eval Board




    National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

    Lead Free product status is available through the search tool located here

    Part Number(s)
    (NSID)
    Weight
    (milligrams)
    TypePinsMSL RatingPeak ReflowRoHS
    Status
    CAD SymbolsModelsPackage
    Marking
    Format
    LM48824TM/NOPB

    3.769
    MICRO SMD161260DetailDownloadN/A
    XYTT
    I GL6
    LM48824TMX/NOPB

    3.769
    MICRO SMD161260DetailDownloadN/A
    XYTT
    I GL6

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM48824.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM48824 is located at RoHS Status.

    Design Tools
    TitleSizeDate
    GUI Software for the LM48824 Eval Board  

    CAD Symbols and Models
    Download LM48824 CAD Symbols
     Models
    N/A


    Audio Solutions for Portable Devices
    Loading video...


    Audio Solutions for Portable Devices
    Date: 2009-03-02
    Length: 00:50:38
    [Information as of 3-Feb-2012]