National Semiconductor | High-performance Analog

 

 LMX2541   
Ultra-Low Noise PLLatinum Frequency Synthesizer with Integrated VCO from the PowerWise® Family		 Click link to Download

Features

Very Low RMS Noise and Spurs

  • -225 dBc/Hz Normalized PLL Phase Noise
  • Integrated RMS Noise (100 Hz - 20 MHz)

  • 2 mrad (100 Hz - 20 MHz) at 2.1 GHz
  • 3.5 mrad (100 Hz - 20 MHz) at 3.5 GHz
  • Ultra Low-Noise Integrated VCO
  • External VCO Option (Internal VCO Bypassed)
  • VCO Frequency Divider 1 to 63 (all values)
  • Programmable Output Power
  • Up to 104 MHz Phase Detector Frequency
  • Integrated Low-Noise LDOs
  • Programmable Charge Pump Output
  • Partially Integrated Loop Filter
  • Digital Frequency Shift Keying (FSK) Modulation Pin
  • Integrated Reference Crystal Oscillator Circuit
  • Hardware and Software Power Down
  • FastLock Mode and VCO-Based Cycle Slip Reduction
  • Analog and Digital Lock Detect
  • 1.6 V Logic Compatibility

    • Description

    The LMX2541 is an ultra low noise frequency synthesizer which integrates a high performance delta-sigma fractional N PLL, a VCO with fully integrated tank circuit, and an optional frequency divider. The PLL offers an unprecedented normalized noise floor of -225 dBc/Hz and can be operated with up to 104 MHz of phase-detector rate (comparison frequency) in both integer and fractional modes. The PLL can also be configured to work with an external VCO.

    The LMX2541 integrates several low-noise, high precision LDOs and output driver matching network to provide higher supply noise immunity and more consistent performance, while reducing the number of external components. When combined with a high quality reference oscillator, the LMX2541 generates a very stable, ultra low noise signal.

    The LMX2541 is offered in a family of 6 devices with varying VCO frequency range from 1990 MHz up to 4 GHz. Using a flexible divider, the LMX2541 can generate frequencies as low as 31.6 MHz. The LMX2541 is a monolithic integrated circuit, fabricated in a proprietary BiCMOS process. Device programming is facilitated using a three-wire MICROWIRE interface that can operate down to 1.6 volts. Supply voltage ranges from 3.15 to 3.45 volts. The LMX2541 is available in a 36 pin 6x6x0.8 mm Lead-Free Leadless Leadframe Package (LLP).

    Device VCO Frequency
    LMX2541SQ2060E 1990 - 2240
    LMX2541SQ2380E 2200 - 2530
    LMX2541SQ2690E 2490 - 2865
    LMX2541SQ3030E 2810 - 3230
    LMX2541SQ3320E 3130 - 3600
    LMX2541SQ3740E 3480 - 4000



    System Block Diagram

     

    ParametersValues
    Max PLL Freq 4000 MHz
    Min PLL Freq 1990 MHz
    Max Aux PLL Freq 2000 MHz
    Min Aux PLL Freq 31.6 MHz
    Normalized PLL Phase Noise -225 dBc/Hz
    Supply Current 150 mA
    Number of PLLs 1
    PLL Type Delta-Sigma Fractional-N
    Max Supply Voltage 3.45 Volt
    Min Supply Voltage 3.15 Volt
    Fastlock Yes
    Temperature Min -40 deg C
    Temperature Max 85 deg C
    Power Consumption 0.5 Watt
    PowerWise Rating 6 85 mW x ps /ch
    PowerWise Yes

    Datasheets
    TitleSizeDateOther
    Language
    LMX2541 Ultra-Low Noise PLLatinum Frequency Synthesizer with Integrated VCO1666
    Kbytes    		1-Nov-10   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1879: Application Note 1879 Fractional N Frequency Synthesis511
    Kbytes    		10-Dec-08 


    Other Technical Documents
    TitleTypeDate
    Solutions for Time Interleaving Ultra-high-speed ADCs at the PCB LevelExternal Article 2009-11-09
    The Tinker's Toolbox - Scott Kulchycki of National Semiconductor on RF-Sampling ADCs (Podcast + Foils)External Article 2011-08-30

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LMX2541SQ2060E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide612
    DIGI-KEYWorldwide0
    		$9.50 each at 1K+ pcsreel
    of
    1000
    LMX2541SQ2380E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide193
    DIGI-KEYWorldwide1692
    		$9.50 each at 1K+ pcsreel
    of
    1000
    LMX2541SQ2690E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide1281
    		$9.50 each at 1K+ pcsreel
    of
    1000
    LMX2541SQ3030E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide595
    		$9.50 each at 1K+ pcsreel
    of
    1000
    LMX2541SQ3320E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide1309
    MOUSERWorldwide900
    		$9.50 each at 1K+ pcsreel
    of
    1000
    LMX2541SQ3740E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide1382
    DIGI-KEYWorldwide1850
    MOUSERWorldwide986
    		$9.50 each at 1K+ pcsreel
    of
    1000
    LMX2541SQE2060E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide250
    AVNET-EMWorldwide250
    CEACAsia Pacific500
    DIGI-KEYWorldwide492
    MOUSERWorldwide250
    TAYLORAmericas250
    		$9.50 each at 1K+ pcsreel
    of
    250
    LMX2541SQE2380E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide250
    AVNET-EMWorldwide250
    DIGI-KEYWorldwide673
    MOUSERWorldwide244
    TAYLORAmericas250
    		$9.50 each at 1K+ pcsreel
    of
    250
    LMX2541SQE2690E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide488
    MOUSERWorldwide245
    		$9.50 each at 1K+ pcsreel
    of
    250
    LMX2541SQE3030E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 8 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide250
    AVNET-EMWorldwide250
    DIGI-KEYWorldwide387
    MOUSERWorldwide250
    TAYLORAmericas250
    		$9.50 each at 1K+ pcsreel
    of
    250
    LMX2541SQE3320E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 8 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide250
    CEACAsia Pacific250
    DIGI-KEYWorldwide580
    MOUSERWorldwide250
    		$9.50 each at 1K+ pcsreel
    of
    250
    LMX2541SQE3740E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide250
    AVNET-EMWorldwide250
    CEACAsia Pacific250
    DIGI-KEYWorldwide371
    MOUSERWorldwide250
    TAYLORAmericas250
    		$9.50 each at 1K+ pcsreel
    of
    250
    LMX2541SQX2060E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$9.50 each at 1K+ pcsreel
    of
    2500
    LMX2541SQX2380E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$9.50 each at 1K+ pcsreel
    of
    2500
    LMX2541SQX2690E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$9.50 each at 1K+ pcsreel
    of
    2500
    LMX2541SQX3030E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$9.50 each at 1K+ pcsreel
    of
    2500
    LMX2541SQX3320E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$9.50 each at 1K+ pcsreel
    of
    2500
    LMX2541SQX3740E/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$9.50 each at 1K+ pcsreel
    of
    2500

    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 LMX2541.

    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 LMX2541 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LMX25412060EVAL/NOPB

    		LMX25412060 Evaluation BoardFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide6
    		$395.00 each1

    Description:

    The LMX2541 Evaluation Board simplifies the evaluation of the LMX2541 device. There is a different evaluation board for each option of the LMX2541 device, but they all use the same instructions and software.

    Contents:

    • Evaluation Board
    • PC Interface Cable
    • Materials available at wireless.national.com:

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LMX25412380EVAL/NOPB

    		LMX25412380 Evaluation BoardFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide2
    		$395.00 each1

    Description:

    The LMX2541 Evaluation Board simplifies the evaluation of the LMX2541 device. There is a different evaluation board for each option of the LMX2541 device, but they all use the same instructions and software.

    Contents:

    • Evaluation Board
    • PC Interface Cable
    • Materials available at wireless.national.com:

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LMX25412690EVAL/NOPB

    		LMX25412690 Evaluation BoardFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    AVNET-EMWorldwide2
    DIGI-KEYWorldwide0
    MOUSERWorldwide1
    		$395.00 each1

    Description:

    The LMX2541 Evaluation Board simplifies the evaluation of the LMX2541 device. There is a different evaluation board for each option of the LMX2541 device, but they all use the same instructions and software.

    Contents:

    • Evaluation Board
    • PC Interface Cable
    • Materials available at wireless.national.com:

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LMX25413030EVAL/NOPB

    		LMX25413030 Evaluation BoardFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide2
    		$395.00 each1

    Description:

    The LMX2541 Evaluation Board simplifies the evaluation of the LMX2541 device. There is a different evaluation board for each option of the LMX2541 device, but they all use the same instructions and software.

    Contents:

    • Evaluation Board
    • PC Interface Cable
    • Materials available at wireless.national.com:

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LMX25413320EVAL/NOPB

    		LMX25413320 Evaluation BoardFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$395.00 each1

    Description:

    The LMX2541 Evaluation Board simplifies the evaluation of the LMX2541 device. There is a different evaluation board for each option of the LMX2541 device, but they all use the same instructions and software.

    Contents:

    • Evaluation Board
    • PC Interface Cable
    • Materials available at wireless.national.com:

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LMX25413740EVAL/NOPB

    		LMX25413740 Evaluation BoardFull production
    Lead Free (RoHS)

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide2
    		$395.00 each1

    Description:

    The LMX2541 Evaluation Board simplifies the evaluation of the LMX2541 device. There is a different evaluation board for each option of the LMX2541 device, but they all use the same instructions and software.

    Contents:

    • Evaluation Board
    • PC Interface Cable
    • Materials available at wireless.national.com:



    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
    LMX2541SQ2060E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    412060E
    LMX2541SQ2380E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    412380E
    LMX2541SQ2690E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    412690E
    LMX2541SQ3030E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    413030E
    LMX2541SQ3320E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    413320E
    LMX2541SQ3740E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    413740E
    LMX2541SQE2060E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    412060E
    LMX2541SQE2380E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    412380E
    LMX2541SQE2690E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    412690E
    LMX2541SQE3030E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    413030E
    LMX2541SQE3320E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    413320E
    LMX2541SQE3740E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    413740E
    LMX2541SQX2060E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    412060E
    LMX2541SQX2380E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    412380E
    LMX2541SQX2690E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    412690E
    LMX2541SQX3030E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    413030E
    LMX2541SQX3320E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    413320E
    LMX2541SQX3740E/NOPB

    		93.079
    		LLP363260DetailDownloadN/A
    		NS
    UZXYTTE#
    413740E

    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 LMX2541.

    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 LMX2541 is located at RoHS Status.

    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LMX2541SQ2060EBICMOS8B+036320027622922783807897
    LMX2541SQ2380EBICMOS8B+036320027622922783807897
    LMX2541SQ2690EBICMOS8B+036320027622922783807897
    LMX2541SQ3030EBICMOS8B+036320027622922783807897
    LMX2541SQ3320EBICMOS8B+036320027622922783807897
    LMX2541SQ3740EBICMOS8B+036320027622922783807897
    LMX2541SQE2060EBICMOS8B+036320027622922783807897
    LMX2541SQE2380EBICMOS8B+036320027622922783807897
    LMX2541SQE2690EBICMOS8B+036320027622922783807897
    LMX2541SQE3030EBICMOS8B+036320027622922783807897
    LMX2541SQE3320EBICMOS8B+036320027622922783807897
    LMX2541SQE3740EBICMOS8B+036320027622922783807897
    LMX2541SQX2060EBICMOS8B+036320027622922783807897
    LMX2541SQX2380EBICMOS8B+036320027622922783807897
    LMX2541SQX2690EBICMOS8B+036320027622922783807897
    LMX2541SQX3030EBICMOS8B+036320027622922783807897
    LMX2541SQX3320EBICMOS8B+036320027622922783807897
    LMX2541SQX3740EBICMOS8B+036320027622922783807897

    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 LMX2541.

    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 LMX2541 is located at RoHS Status.

    Software-Defined Radio (SDR) Webinar
    Click image to play video in new window


    Clock Design Tool - Getting Started
    Loading video...


    Clock Design Tool - Device Simulation
    Loading video...


    Clock & Timing - Low Noise Frequency Synthesizers
    Loading video...


    Clock Design Tool - Loop Filter Design
    Loading video...


    LMX2541 - Evaluation Board Hookup
    Loading video...


    LMX2541 - Phase Noise Performance
    Loading video...


    LMX2541 - Simulation Using National's Clock Design Tool
    Loading video...


    LMX2541 - Fractional Spur Performance
    Loading video...


    LMX2541 - Features & Performance Overview
    Loading video...


    Communications Infrastructure Overview
    Loading video...


    What's New in Signal Path -- November 09
    Loading video...


    Software-Defined Radio (SDR) Webinar
    Date: 2010-08-30
    Length: 0:28:23
    Clock Design Tool - Getting Started
    Date: 2010-03-22
    Length: 0:11:48
    Clock Design Tool - Device Simulation
    Date: 2010-03-22
    Length: 0:08:52
    Clock & Timing - Low Noise Frequency Synthesizers
    Date: 2009-07-21
    Length: 0:45:52
    Clock Design Tool - Loop Filter Design
    Date: 2010-03-22
    Length: 0:05:31
    LMX2541 - Evaluation Board Hookup
    Date: 2010-03-26
    Length: 0:7:3
    LMX2541 - Phase Noise Performance
    Date: 2010-03-26
    Length: 0:13:28
    LMX2541 - Simulation Using National's Clock Design Tool
    Date: 2010-03-26
    Length: 0:10:6
    LMX2541 - Fractional Spur Performance
    Date: 2010-03-26
    Length: 0:14:17
    LMX2541 - Features & Performance Overview
    Date: 2010-03-26
    Length: 0:11:58
    Communications Infrastructure Overview
    Date: 2009-08-04
    Length: 00:64:17
    What's New in Signal Path -- November 09
    Date: 2009-12-07
    Length: 0:08:13
    [Information as of 3-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation