National Semiconductor | High-performance Analog

 

 LM98714   

Three Channel, 16-Bit, 45 MSPS Digital Copier Analog Front End with Integrated CCD/CIS Sensor Timing Generator and LVDS Output
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Features
  • LVDS/CMOS Outputs
  • LVDS/CMOS Pixel Rate Input Clock or ADC Input Clock
  • CDS or S/H Processing for CCD or CIS sensors
  • Independent Gain/Offset Correction for Each Channel
  • Digital Black Level Correction Loop for Each Channel
  • Programmable Input Clamp Voltage
  • Flexible CCD/CIS Sensor Timing Generator
  • Description

    The LM98714 is a fully integrated, high performance 16-Bit, 45 MSPS signal processing solution for digital color copiers, scanners, and other image processing applications. High-speed signal throughput is achieved with an innovative architecture utilizing Correlated Double Sampling (CDS), typically employed with CCD arrays, or Sample and Hold (S/H) inputs (for Contact Image Sensors and CMOS image sensors). The signal paths utilize 8 bit Programmable Gain Amplifiers (PGA), a +/-9-Bit offset correction DAC and independently controlled Digital Black Level correction loops for each input. The PGA and offset DAC are programmed independently allowing unique values of gain and offset for each of the three inputs. The signals are then routed to a 45MHz high performance analog-to-digital converter (ADC). The fully differential processing channel shows exceptional noise immunity, having a very low noise floor of -74dB. The 16-bit ADC has excellent dynamic performance making the LM98714 transparent in the image reproduction chain.

    Key Specification

    Maximum Input Level

    1.2 or 2.4 Volt Modes

     

    (both with + or - polarity option)

    ADC Resolution

    16-Bit

    ADC Sampling Rate

    45 MSPS

    INL

    +/- 23 LSB (typ)

    Channel Sampling Rate

    15/22.5/30 MSPS

    PGA Gain Steps

    256 Steps

    PGA Gain Range

    0.7 to 7.84x

    Analog DAC Resolution

    +/-9 Bits

    Analog DAC Range

    +/-300mV or +/-600mV

    Digital DAC Resolution

    +/-6 Bits

    Digital DAC Range

    -1024 LSB to + 1008 LSB

    SNR

    -74dB (@0dB PGA Gain)

    Power Dissipation

    505mW (LVDS) 610mW (CMOS)

    Operating Temp

    0 to 70°C

    Supply Voltage

    3.3V Nominal (3.0V to 3.6V range)


    Applications

  • Multi-Function Peripherals
  • Facsimile Equipment
  • Flatbed or Handheld Color Scanners
  • High-speed Document Scanner
  • Also Recommended
    LM98519For A 6-channel AFE, With CMOS Outputs
    LM98620For A 6-channel AFE, With LVDS Outputs
    LM98725For A Higher Speed, More Feature-rich Product



    Typical Application
    click for larger image


    Block Diagram
    click for larger image


    Parameters / ValuesLM98714 LM98519 LM98620 LM98725
    Input Channels3 6 6 3
    ADC Sampling Rate45 MSPS 65 MSPS 70 MSPS 81 MSPS
    Channel Sampling Rate (MSPS)15 to 30 5 to 32.5 5 to 35 3 to 30
    ADC Resolution16 bits 10 bits 10 bits 16 bits
    Input Signal PolarityBoth Negative Both Pos, Neg Both Pos, Neg
    Input Sampler TypeBoth SH, CDS Both SH, CDS Both SH, CDS Both SH, CDS
    Integrated Timing GeneratorYes No No Yes
    Output TypeBoth LVDS, CMOS CMOS LVDS Both LVDS, CMOS
    Input Voltage Swing (Max)2.4 Volt 1.19 Volt 1.2 Volt 2.3 Volt
    INL (+/-)23 LSB 0.9 LSB 0.8 LSB 23 LSB
    PGA Gain Resolution8 bits 9 bits 9 bits 8 bits
    PGA Gain (Min)-3 dB 0 dB 0 dB -4.2 dB
    PGA Gain (Max)17.9 dB 26 dB 26 dB 18.4 dB
    DAC Offset Resolution (+/-)9 bits 14 bits 14 bits 9 bits
    DAC Offset Range (+/-)600 mV 337 mV 340 mV 307 mV
    Supply Voltage3.3 Volt 3.3 Volt 3.3 Volt 3.3 Volt
    Power Dissipation0.505 Watt 1.04 Watt 1.02 Watt 0.755 Watt

    Datasheets
    TitleSizeDateOther
    Language
    LM98714 Three Channel, 16-Bit, 45 MSPS Digital Copier Analog Front End with Integrated CCD/CIS Sensor Timing Generator and LVDS Output599
    Kbytes
    12-Oct-06   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1538: Application Note 1538 Interfacing DS90CR218A with LM98714280
    Kbytes
    17-Mar-07 中文

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM98714BCMT/NOPB


    RoHS Status


    TSSOP
    Full production
    Lead Time: 16 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide5957
    DIGI-KEYWorldwide12
    MOUSERWorldwide38
    $17.00 each at 100+ pcsrail
    of
    38
    LM98714BCMTX/NOPB


    RoHS Status


    TSSOP
    Full production
    Lead Time: 20 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $17.00 each at 100+ 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 LM98714.

    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 LM98714 is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM98714EB01
    evaluation boardFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $500.00 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
    LM98714BCMT/NOPB

    201.231
    TSSOP482260DetailDownload
    ibis file
    NSUZXYTTE#
    LM98714
    BCMT
    LM98714BCMTX/NOPB

    201.231
    TSSOP482260DetailDownload
    ibis file
    NSUZXYTTE#
    LM98714
    BCMT

    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 LM98714.

    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 LM98714 is located at RoHS Status.

    CAD Symbols and Models
    Download LM98714 CAD Symbols
     Models

    ibis file


    [Information as of 6-Feb-2012]