LM2917 Frequency to Voltage Converter – Datasheet

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The LM2917 is a monolithic frequency to voltage converters with a high gain op-amp/comparator designed to operate a relay, lamp, or another 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 in two versions (LM2907-8, LM2917-8), and its output swings to the ground for a zero frequency input.

LM2917 Pinout

LM2917 Pin Configuration

Pin NoDescription
1Input Frequency
2Charge Pump Pin
3Input Bias Current
4Output Voltage
5Sink Current
6Positive Voltage
7 Input Bias Current
8Input Signal Ground Pin

LM2917 Features

  • Ground referenced tachometer input interfaces directly with variable reluctance magnetic pickups
  • Op amp/comparator 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
  • Built-in Zener on LM2917
  • Ground referenced tachometer is fully protected from damage due to swings above VCC and below ground

Application

  • 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
  • Touch or sound switches

You can download this datasheet for LM2917 Frequency to Voltage Converter – Datasheet from the link given below: