National Semiconductor | High-performance Analog

 

 LMV1091   

Dual Input, Far Field Noise Suppression Microphone Amplifier from the PowerWise® Family
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Features

  • No loss of voice intelligibility
  • Low power consumption
  • Shutdown function
  • No added processing delay
  • Differential outputs
  • Adjustable 12 - 54dB gain
  • Excellent RF immunity
  • Available in a 25–bump micro SMD package
  • Description

    The LMV1091 is a fully analog dual differential input, differential output, microphone array amplifier designed to reduce background acoustic noise, while delivering superb speech clarity in voice communication applications.

    The LMV1091 preserves near-field voice signals within 4cm of the microphones while rejecting far-field acoustic noise greater than 50cm from the microphones. Up to 20dB of far-field rejection is possible in a properly configured and using ±0.5dB matched micropohones.

    Part of the Powerwise™ family of energy efficient solutions, the LMV1091 consumes only 600μA of supply current providing superior performance over DSP solutions consuming greater than ten times the power.

    The dual microphone inputs and the processed signal output are differential to provide excellent noise immunity. The microphones are biased with an internal low-noise bias supply.

    Key Specification

    Far Field Noise Suppression Electrical *

    34dB (typ)

    SNRIE

    26dB (typ)

    Supply voltage

    2.7V to 5.5V

    Supply current

    600μA (typ)

    Standby current

    0.1μA (typ)

    Signal-to-Noise Ratio (Voice band)

    65dB (typ)

    Total Harmonic Distortion + Noise

    0.1% (typ)

    PSRR (217Hz)

    99dB (typ)

       *FFNSE at f = 1kHz


    Applications

  • Mobile headset
  • Mobile and handheld two-way radios
  • Bluetooth and other powered headsets
  • Hand-held voice microphones
  • Also Recommended
    LMV1088Far Field Noise Reduction With Single Ended Output And Calibration
    LMV1089Far Field Noise Reduction With Diff. Output, Shutdown Pin And Calibration
    LMV1090Far Field Noise Reduction With Diff. Output, Shutdown Pin And No Calibration



    Parameters / ValuesLMV1091 LMV1088 LMV1089 LMV1090
    FunctionBeamforming Beamforming Beamforming Beamforming
    UplinkYes Yes Yes Yes
    DownlinkNo No No No
    Special FeaturesPin-Programmable Version of LMV1090 Auto-calibration Auto-calibration I2C Controlled
    Mono/StereoMono Mono Mono Mono
    Auto CalibrationNo Yes Yes No
    Output TypeDifferential Single-Ended Differential Differential
    Shut downNo No Yes Yes
    FFNRI (electrical)34 dB 32 dB 32 dB 34 dB
    SNRI (electrical)26 dB 24 dB 24 dB 26 dB
    Supply Current0.6 mA 1 mA 1.1 mA 0.6 mA
    THD0.1 % 0.1 % 0.1 % 0.1 %
    SNR65 dB 60 dB 65 dB 65 dB
    PSRR99 dB 85 dB 96 dB 99 dB
    Supply Min2.7 Volt 2.7 Volt 2.7 Volt 2.7 Volt
    Supply Max5.5 Volt 5.5 Volt 5.5 Volt 5.5 Volt
    User Supply3.3 Volt 3.3 Volt 3.3 Volt 3.3 Volt
    Control SchemeBit select I2C I2C, Bit select I2C
    Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C
    Temperature Max85 deg C 85 deg C 85 deg C 85 deg C
    PowerWiseYes Yes Yes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LMV1091 Dual Input, Far Field Noise Suppression Microphone Amplifier850
    Kbytes
    13-Jan-11   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1989: Application Note 1989 LMV1091 Noise Suppression Microphone Amplifier Evaluation Kit Users`s Guide4087
    Kbytes
    12-Nov-09 中文

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LMV1091TM/NOPB


    RoHS Status


    MICRO SMD
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide149
    DIGI-KEYWorldwide413
    $0.75 each at 1K+ pcsreel
    of
    250
    LMV1091TMX/NOPB


    RoHS Status


    MICRO SMD
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $0.75 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 LMV1091.

    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 LMV1091 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LMV1091TMEVAL
    evaluation boardFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $150.00 each1



    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
    LMV1091TM/NOPB

    5.506
    MICRO SMD251260DetailDownloadN/A
    XYTT
    I ZA4
    LMV1091TMX/NOPB

    5.506
    MICRO SMD251260DetailDownloadN/A
    XYTT
    I ZA4

    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 LMV1091.

    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 LMV1091 is located at RoHS Status.

    CAD Symbols and Models
    Download LMV1091 CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LMV1091TMCMOS70213010015840003449464325
    LMV1091TMXCMOS70213010015840003449464325

    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.


    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 LMV1091.

    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 LMV1091 is located at RoHS Status.

    LMV108x/LMV109x Analog Noise-Suppression Technology
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    LMV108x/LMV109x Analog Noise-Suppression Technology
    Date: 2008-04-24
    Length: 0:1:59
    [Information as of 9-Feb-2012]