LM2907 (Frequency to Voltage Converter ) DIP-8

The LM2907 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.

LM2907 Pinout

LM2907 Pin Configuration

LM2907 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