National Semiconductor | High-performance Analog

 

 LMH2180   
75 MHz Dual Clock Buffer 		Click link to Download

Features

(Typical values are: VSUPPLY = 2.7V and CL = 10 pF, unless otherwise specified.)

Small signal bandwidth

78 MHz

Supply voltage range

2.4V to 5V

Phase noise (VIN = 1 VPP,

fC = 38.4 MHz, Δf = 1 kHz)

−123 dBc/Hz

Slew rate

106 V/μs

Total supply current

2.3 mA

Shutdown current

30 µA

Rail-to-rail input and output

Individual buffer enable pins

Rapid Ton technology

Crosstalk rejection circuitry

  • Packages:

  • 8-Pin LLP, Solder Bump and no Pullback
  • 8-Bump micro SMD

    • Temperature range

    −40°C to 85°C

    Description

    The LMH2180 is a high speed dual clock buffer designed for portable communications and applications requiring multiple accurate multi-clock systems. The LMH2180 integrates two 75 MHz low noise buffers with independent shutdown pins into a small package. The LMH2180 ensures superb system operation between the baseband and the oscillator signal path by eliminating crosstalk between the multiple clock signals.

    Unique technology and design provides the LMH2180 with the ability to accurately drive both large capacitive and resistive loads. Low supply current combined with shutdown pins for each channel means the LMH2180 is ideal for battery powered applications. This part does not use an internal ground reference, thus providing additional system flexibility.

    The flexible buffers provide system designers the capacity to manage complex clock signals in the latest wireless applications. Each buffer delivers 106 V/μs internal slew rate with independent shutdown and duty cycle precision. Each input is internally biased to 1V, removing the need for external resistors. Both channels have rail-to-rail inputs and outputs, a gain of one, and are AC coupled with the use of one capacitor.

    Replacing a discrete buffer solution with the LMH2180 provides many benefits: simplified board layout, minimized parasitic components, simplified BOM, design durability across multiple applications, simplification of clock paths, and the ability to reduce the number of clock signal generators in the system. The LMH2180 is produced in the tiny packages minimizing the required PCB space.


    Applications

  • 3G mobile applications
  • WLAN–WiMAX modules
  • TD_SCDMA multi-mode MP3 and camera
  • GSM modules
  • Oscillator modules



    • Typical Application

     

    ParametersValues
    Output Current 65 mA
    Slew Rate 124 Volts/usec
    Channels 2 Channels
    Buffer Type Fixed
    Av+1 BW 75 MHz
    Supply Current Per Channel 1.8 mA
    PowerWise Rating 2 24 uA/MHz
    Gain 1 V/V
    Supply Min 2.4 Volt
    Supply Max 5 Volt
    Offset Voltage max, 25C 21 mV
    Max Input Bias Current 36000 nA
    Voltage Noise 12 nV/root(Hz)
    Special Features Independent Shutdown
    Gain Bandwidth 75 MHz
    Function Buffer
    Temperature Min -40 deg C
    Temperature Max 85 deg C

    Datasheets
    TitleSizeDateOther
    Language
    LMH2180 75 MHz Dual Clock Buffer545
    Kbytes    		29-Aug-11   


    Application Notes
    TitleSizeDateOther
    Language
    AN-1863: Application Note 1863 LMH2180 Evaluation Board in micro SMD236
    Kbytes    		21-Aug-08 
    AN-1776: Application Note 1776 LMH2180 Evaluation Board in LLP229
    Kbytes    		21-Aug-08 中文

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LMH2180SD/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.20 each at 1K+ pcsreel
    of
    1000
    LMH2180SDE/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide500
    DIGI-KEYWorldwide562
    FARNELLEurope and Asia177
    MOUSERWorldwide300
    TAYLORAmericas500
    		$1.20 each at 1K+ pcsreel
    of
    250
    LMH2180SDX/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.20 each at 1K+ pcsreel
    of
    4500
    LMH2180TM/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide846
    MOUSERWorldwide350
    		$1.10 each at 1K+ pcsreel
    of
    250
    LMH2180TMX/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.10 each at 1K+ pcsreel
    of
    3000
    LMH2180YD/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide1923
    FARNELLEurope and Asia89
    MOUSERWorldwide1000
    		$1.20 each at 1K+ pcsreel
    of
    1000
    LMH2180YDX/NOPB


    RoHS Status

    LLP    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$1.20 each at 1K+ pcsreel
    of
    4500

    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 LMH2180.

    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 LMH2180 is located at RoHS Status.

    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LMH2180SDEVAL
    		Evaluation Board for the LMH2180 75 MHz Dual Clock BufferFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$90.00 each1

    Description:

    This evaluation board is designed to aid in the characterization of National Semiconductors LMH2180 75MHz Dual Clock Buffer. This board simplifies the connection and ease of use of any oscillating input device. Use this evaluation board as a guide for high frequency layout and as a tool to aid in device Testing and characterization.

    Contents:


    Part Number(s)
    (NSID)    		DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LMH2180TMEVAL
    		LMH2180 Evaluation Board in Micro SMDFull production


     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$90.00 each1

    Description:

    This evaluation board is designed to aid in the characterization of National Semiconductor`s LMH2180 75 MHz Dual Clock Buffer in micro SMD package. This board simplifies the connection and ease of use of any oscillating input device. Use this evaluation board as a guide for high frequency layout and as a tool to aid in device testing and characterization.

    Contents:




    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
    LMH2180SD/NOPB

    		20.736
    		LLP81260DetailDownloadN/A
    		ZXYTT
    2180S
    LMH2180SDE/NOPB

    		20.736
    		LLP81260DetailDownloadN/A
    		ZXYTT
    2180S
    LMH2180SDX/NOPB

    		20.736
    		LLP81260DetailDownloadN/A
    		ZXYTT
    2180S
    LMH2180TM/NOPB

    		1.93
    		MICRO SMD81260DetailDownloadN/A
    		XVA
    I A
    LMH2180TMX/NOPB

    		1.93
    		MICRO SMD81260DetailDownloadN/A
    		XVA
    I A
    LMH2180YD/NOPB

    		21.663
    		LLP81260DetailDownloadN/A
    		ZXYTT
    2180Y
    LMH2180YDX/NOPB

    		21.662
    		LLP81260DetailDownloadN/A
    		ZXYTT
    2180Y

    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 LMH2180.

    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 LMH2180 is located at RoHS Status.

    CAD Symbols and Models
    Download LMH2180 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LMH2180SDCMOS70213010015840003449464325
    LMH2180SDECMOS70213010015840003449464325
    LMH2180SDXCMOS70213010015840003449464325
    LMH2180TMCMOS70213010015840003449464325
    LMH2180TMXCMOS70213010015840003449464325
    LMH2180YDCMOS70213010015840003449464325
    LMH2180YDXCMOS70213010015840003449464325

    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 LMH2180.

    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 LMH2180 is located at RoHS Status.

    [Information as of 9-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation