LM2917N-14 ,Frequency to Voltage ConverterFeatures YClutch controlYGround referenced tachometer input interfaces directlyYHorn controlwith va ..
LM2917N-8 ,Frequency to Voltage ConverterLM2907/LM2917 Frequency to Voltage ConverterMay 2003LM2907/LM2917Frequency to Voltage Convertern On ..
LM2917P , FREQUENCY-TO-VOLTAGE CONVERTERS
LM2924M ,Low Power Operational Amplifier/Voltage ComparatorFEATURESn Eliminates need for dual power suppliesn Low output saturation voltage: 250 mV at 4 mAn A ..
LM2925T ,Low Dropout Regulator with Delayed Resetapplications, the LM2925n Short circuit protectionand all regulated circuitry are protected from re ..
LM2926T ,Low Dropout Regulator with Delayed ResetApplications
included in the LM2926 making it suitable tor use in automo- I Battery operated equ ..
LM78L05F , SOT-89 Encapsulate Three Terminal Voltage Regulator
LM78L05IBPX ,3-Terminal Positive RegulatorsLM78LXX Series 3-Terminal Positive RegulatorsFebruary 2005LM78LXX Series3-Terminal Positive Regulat ..
LM78L05TA , 3-TERMINAL 0.1A POSITIVE VOLTAGE REGULATOR
LM78L06F , 3-TERMINAL 0.1A POSITIVE VOLTAGE REGULATOR
LM78L08 , LM78L00Series 3-Terminal Low Current Positive Voltage Regulators
LM78L08 , LM78L00Series 3-Terminal Low Current Positive Voltage Regulators
LM2917N-14
Frequency to Voltage Converter
TL/H/7942
LM2907/LM2917
Frequency
Voltage
Converter
February 1995
LM2907/LM2917 Frequency to Voltage Converter
General Description
The LM2907, LM2917 seriesare monolithic frequencyto
voltage converterswitha high gainop amp/comparatorde-
signedtooperatea relay, lamp,or other load whenthe input
frequency reachesor exceedsa selected rate.The tachom-
eter usesa charge pump technique and offers frequency
doublingforlow ripple,full input protectionintwo versions
(LM2907-8, LM2917-8)andits output swingsto groundfora
zero frequency input.
Advantages Output swingsto groundfor zero frequency input Easyto use; VOUTefINc VCCcR1cC1 Only oneRC network provides frequency doubling Zener regulatoron chip allows accurateand stablefre-
quencyto voltageor current conversion (LM2917)
Features Ground referenced tachometer input interfaces directly
with variable reluctance magnetic pickupsOp amp/comparatorhas floating transistor output50mA sinkor sourceto operate relays, solenoids,me-
ters,or LEDs Frequency doublingforlow ripple Tachometer has built-in hysteresis with either differen-
tial inputor ground referenced input Built-in zeneron LM2917 g0.3% linearity typical Ground referenced tachometeris fully protected from
damage dueto swings above VCCand below ground
Applications Over/under speed sensing Frequencyto voltage conversion (tachometer) Speedometers Breaker point dwell meters Hand-held tachometer Speed governors Cruise control Automotive door lock control Clutch control Horn control Touchor sound switches
Block and Connection Diagrams Dual-In-Lineand SmallOutline Packages,Top Views
TL/H/7942–1
Order Number LM2907M-8or LM2907N-8
SeeNS Package NumberM08Aor N08E
TL/H/7942–2
Order Number LM2917M-8orLM2917N-8
See NSPackageNumber M08Aor N08E
TL/H/7942–3
Order Number LM2907N
SeeNS Package Number N14A
TL/H/7942–4
Order Number LM2917MorLM2917N
SeeNS PackageNumberM14Aor N14A
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
