National Semiconductor | High-performance Analog

 

 LMV1088   

Dual Input, Far Field Noise Suppression Microphone Amplifier with Automatic Calibration Ability from the PowerWise® Family
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Features

  • Low power consumption
  • No added processing delay
  • Automatic Calibration
  • Space-saving 36 Bump micro SMD package
  • Up to 20dB SNRI
  • Description

    The LMV1088 amplifies near-field voice signals within 4cm of the microphones while rejecting far-field acoustic noise greater than 0.5m from the microphones. Up to 20dB of far-field rejection is possible in a properly configured and calibrated system.

    Part of the Powerwise® family of energy efficient solutions, the LMV1088 consumes 1mA of supply current while providing superior performance to DSP solutions consuming over 10 times the power.

    A fast calibration during the manufacturing test process allows the LMV1088 to compensate the entire microphone system. This calibration includes mismatch in microphone gain and frequency response, as well as acoustical path variances. The LMV1088 stores the calibration coefficients in on-board EEPROM. The calibration is initiated by I2C command or by pin control.

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

    Key Specification

    (3.3V supply, unless otherwise specified)

    Supply voltage

    2.7V to 5.5V

    Supply current

    1mA (typ)

    Signal to noise ratio (A-weighted)

    60dB (typ)

    Total harmonic distortion

    0.1% (typ)

    Noise cancellation

    20dB (typ)

    PSRR

    85dB (typ)


    Applications

  • Mobile handsets
  • Mobile and handheld two-way radios
  • Bluetooth and other powered headsets
  • Hand-held voice microphones
  • Portable public address systems
  • Also Recommended
    LMV1089Differential Output + Shutdown Pin
    LMV1090Improved Performance


    simplified application

    Parameters / ValuesLMV1088 LMV1089 LMV1090
    FunctionBeamforming Beamforming Beamforming
    UplinkYes Yes Yes
    DownlinkNo No No
    Special FeaturesAuto-calibration Auto-calibration I2C Controlled
    Mono/StereoMono Mono Mono
    Auto CalibrationYes Yes No
    Output TypeSingle-Ended Differential Differential
    Shut downNo Yes Yes
    FFNRI (electrical)32 dB 32 dB 34 dB
    SNRI (electrical)24 dB 24 dB 26 dB
    Supply Current1 mA 1.1 mA 0.6 mA
    THD0.1 % 0.1 % 0.1 %
    SNR60 dB 65 dB 65 dB
    PSRR85 dB 96 dB 99 dB
    Supply Min2.7 Volt 2.7 Volt 2.7 Volt
    Supply Max5.5 Volt 5.5 Volt 5.5 Volt
    User Supply3.3 Volt 3.3 Volt 3.3 Volt
    Control SchemeI2C I2C, Bit select I2C
    Temperature Min-40 deg C -40 deg C -40 deg C
    Temperature Max85 deg C 85 deg C 85 deg C
    PowerWiseYes Yes Yes
    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LMV1088RL/NOPB


    RoHS Status


    MICRO SMDXT
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide583
    MOUSERWorldwide250
    NEWARKAmericas13
    $1.50 each at 1K+ pcsreel
    of
    250
    LMV1088RLX/NOPB


    RoHS Status


    MICRO SMDXT
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $1.50 each at 1K+ pcsreel
    of
    1000

    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 LMV1088.

    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 LMV1088 is located at RoHS Status.

    Part Number(s)
    (NSID)
    Weight
    (milligrams)
    TypePinsMSL RatingPeak ReflowRoHS
    Status
    CAD SymbolsModelsPackage
    Marking
    Format
    LMV1088RL/NOPB

    13.256
    MICRO SMDXT361260DetailDownloadN/A
    XYTT
    I ZA1
    LMV1088RLX/NOPB

    13.256
    MICRO SMDXT361260DetailDownloadN/A
    XYTT
    I ZA1

    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 LMV1088.

    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 LMV1088 is located at RoHS Status.

    LMV108x/LMV109x Analog Noise-Suppression Technology
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    PowerWise Products and Metrics -- An Overview
    Loading video...


    Audio Solutions for Portable Devices
    Loading video...


    LMV108x/LMV109x Analog Noise-Suppression Technology
    Date: 2008-04-24
    Length: 0:1:59
    PowerWise Products and Metrics -- An Overview
    Date: 2008-05-11
    Length: 00:13:36
    Audio Solutions for Portable Devices
    Date: 2009-03-02
    Length: 00:50:38
    [Information as of 3-Feb-2012]