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LM2917 Frequency to Voltage Converter

Now available from PMD Way is the interesting LM2917 Frequency to Voltage Converter IC.
The LM2917 is a monolithic frequency to voltage converter with a high gain op amp/comparator designed to switch 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 as the output swings to ground for a zero frequency input.


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

  • Output swings to ground for zero frequency input 
  • Simple to use VOUT = freq.IN x VCC x R1 x C1 
  • Only one RC network provides frequency doubling 
  • Zener regulator on chip allows accurate and stable frequency to voltage or current conversion
  • 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 
  • Y Touch or sound switches

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