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LM2907N/NOPB
Frequency to Voltage Converter
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LM2907-N, LM2917-NSNAS555D –JUNE 2000–REVISED DECEMBER 2016
LM2907 and LM2917 Frequencyto Voltage Converter Features Ground Referenced Tachometer Input Interfaces
Directly With Variable Reluctance Magnetic
Pickups Op Amp Has Floating Transistor Output 50-mA Sinkor Sourceto Operate Relays,
Solenoids, Meters,or LEDs Frequency Doubling For Low Ripple Tachometer Has Built-In Hysteresis With Either
Differential Inputor Ground Referenced Input ±0.3% Linearity (Typical) Ground-Referenced Tachometeris Fully Protected
From Damage Dueto Swings Above VCC and
Below Ground Output Swingsto Ground For Zero Frequency
Input Easyto Use; VOUT=fIN× VCC× R1× C1 Zener Regulatoron Chip allows Accurate and
Stable Frequencyto Voltageor Current
Conversion (LM2917)
Applications Over- and Under-Speed Sensing Frequency-to-Voltage Conversion (Tachometer) Speedometers Breaker Point Dwell Meters Hand-Held Tachometers Speed Governors Cruise Control Automotive Door Lock Control Clutch Control Horn Control Touchor Sound Switches
DescriptionThe LM2907 and LM2917 devices are monolithic
frequency-to-voltage converters witha high gain op
amp designedto operatea relay, lamp,or other load
when the input frequency reaches or exceedsa
selected rate. The tachometer usesa charge pump
technique and offers frequency doubling for low-
ripple, full-input protection in two versions (8-pin
LM2907 and LM2917), and its output swings to
groundfora zero frequency input.
The op ampis fully compatible with the tachometer
and hasa floating transistorasits output. This feature
allows eithera groundor supply referred loadofupto mA. The collector maybe taken above VCCuptoa
maximum VCEof28V.
The two basic configurations offered includean 8-pin
device witha ground-referenced tachometer input
and an internal connection between the tachometer
output and the op amp noninverting input. This
versionis well suited for single speedor frequency
switching or fully buffered frequency-to-voltage
conversion applications.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Minimum Component Tachometer Diagram
