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SNAS555D – JUNE 2000 – REVISED DECEMBER 2016 LM2907 and LM2917 Frequency to Voltage Converter
1 Features 3 Description The LM2907 and LM2917 devices are monolithic
frequency-to-voltage converters with a high gain op
amp 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 lowripple, full-input protection in two versions (8-pin
LM2907 and LM2917), and its output swings to
ground for a zero frequency input. 1 Ground Referenced Tachometer Input Interfaces
Directly With Variable Reluctance Magnetic
Pickups
Op Amp 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 …
