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LM2907-LM2917
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.
