National Semiconductor | High-performance Analog

 

 LM2917   
Frequency to Voltage Converter 		Click link to Download

Features

  • Ground referenced tachometer input interfaces directly with variable reluctance magnetic pickups
  • Op amp/comparator has floating transistor output
  • 50 mA sink or source to operate relays, solenoids, meters, or LEDs
  • Frequency doubling for low ripple
  • Tachometer has built-in hysteresis with either differential input or ground referenced input
  • Built-in zener on LM2917
  • ±0.3% linearity typical
  • Ground referenced tachometer is fully protected from damage due to swings above VCC and below ground

    • Description

    The LM2907, LM2917 series are monolithic frequency to voltage converters with a high gain op amp/comparator designed to operate a relay, lamp, or other load when the input frequency reaches or exceeds a selected rate. The tachometer uses a charge pump technique and offers frequency doubling for low ripple, full input protection in two versions (LM2907-8, LM2917-8) and its output swings to ground for a zero frequency input.

    The op amp/comparator is fully compatible with the tachometer and has a floating transistor as its output. This feature allows either a ground or supply referred load of up to 50 mA. The collector may be taken above VCC up to a maximum VCE of 28V.

    The two basic configurations offered include an 8-pin device with a ground referenced tachometer input and an internal connection between the tachometer output and the op amp non-inverting input. This version is well suited for single speed or frequency switching or fully buffered frequency to voltage conversion applications.

    The more versatile configurations provide differential tachometer input and uncommitted op amp inputs. With this version the tachometer input may be floated and the op amp becomes suitable for active filter conditioning of the tachometer output.

    Both of these configurations are available with an active shunt regulator connected across the power leads. The regulator clamps the supply such that stable frequency to voltage and frequency to current operations are possible with any supply voltage and a suitable resistor.


    Applications

  • Over/under speed sensing
  • Frequency to voltage conversion (tachometer)
  • Speedometers
  • Breaker point dwell meters
  • Hand-held tachometer
  • Speed governors
  • Cruise control
  • Automotive door lock control
  • Clutch control
  • Horn control
  • Touch or sound switches




    •  

    ParametersValues
    Temperature Min -40 deg C
    Temperature Max 85 deg C
    Function Frequency to Voltage

    Datasheets
    TitleSizeDateOther
    Language
    LM2917 Frequency to Voltage Converter542
    Kbytes    		9-Dec-08   


    Application Notes
    TitleSizeDateOther
    Language
    AN-162: Application Note 162 LM2907 Tachometer/Speed Switch Building Block Applications309
    Kbytes    		1-May-04 

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM2917M/NOPB

    LM2917M

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide294
    AVNET-EMWorldwide638
    BRITESTONESouth Korea7
    DIGI-KEYWorldwide1027
    FARNELLEurope and Asia583
    MOUSERWorldwide494
    NEWARKAmericas980
    TAYLORAmericas1190
    		$0.72 each at 1K+ pcsrail
    of
    55
    LM2917M-8/NOPB

    LM2917M-8

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide467
    BRITESTONESouth Korea2565
    DIGI-KEYWorldwide632
    FARNELLEurope and Asia911
    MOUSERWorldwide535
    NEWARKAmericas735
    RS COMPONENTSWorldwide389
    TAYLORAmericas752
    		$0.72 each at 1K+ pcsrail
    of
    95
    LM2917MX/NOPB

    LM2917MX

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.72 each at 1K+ pcsreel
    of
    2500
    LM2917MX-8/NOPB

    LM2917MX-8

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide2500
    DIGI-KEYWorldwide0
    MOUSERWorldwide2500
    		$0.72 each at 1K+ pcsreel
    of
    2500
    LM2917N/NOPB

    LM2917N

    RoHS Status

    MDIP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1253
    AVNET-EMWorldwide265
    BRITESTONESouth Korea2253
    DIGI-KEYWorldwide1414
    FARNELLEurope and Asia715
    MOUSERWorldwide413
    NEWARKAmericas179
    RS COMPONENTSWorldwide20
    TAYLORAmericas1254
    		$0.76 each at 1K+ pcsrail
    of
    25
    LM2917N-8/NOPB

    LM2917N-8

    RoHS Status

    MDIP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide210
    AVNET-EMWorldwide107
    DIGI-KEYWorldwide386
    FARNELLEurope and Asia624
    MOUSERWorldwide51
    NEWARKAmericas12
    RS COMPONENTSWorldwide85
    TAYLORAmericas586
    		$0.76 each at 1K+ pcsrail
    of
    40

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2917MXEP
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008

    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 LM2917.

    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 LM2917 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM2917M/NOPB

    LM2917M
    		129.551
    130.001
    		SOIC NARROW141
    1    		260
    235    		DetailN/AN/A
    		NSUZXYTTE#
    LM2917M
    LM2917M-8/NOPB

    LM2917M-8
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    LM29
    17M-8
    LM2917MX/NOPB

    LM2917MX
    		129.551
    130.001
    		SOIC NARROW141
    1    		260
    235    		DetailN/AN/A
    		NSUZXYTTE#
    LM2917M
    LM2917MX-8/NOPB

    LM2917MX-8
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailN/AN/A
    		NSZXTT
    LM29
    17M-8
    LM2917N/NOPB

    LM2917N
    		986.751
    990.002
    		MDIP141
    1    		NA
    NA    		DetailN/AN/A
    		NSUZXYYTTE#
    LM2917N
    LM2917N-8/NOPB

    LM2917N-8
    		508.252
    510.002
    		MDIP81
    1    		NA
    NA    		DetailN/AN/A
    		NSUZXYTTE#
    LM
    2917N-8

    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 LM2917.

    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 LM2917 is located at RoHS Status.

    CAD Symbols and Models
    N/A
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM2917MSLM04404600353250011002356520
    LM2917M-8SLM04404600353250011002356520
    LM2917MXSLM04404600353250011002356520
    LM2917MX-8SLM04404600353250011002356520
    LM2917NSLM04404600353250011002356520
    LM2917N-8SLM04404600353250011002356520

    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 LM2917.

    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 LM2917 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM2917MXEP
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008

    [Information as of 3-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation