Description
Description
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
| Pin No | Description |
|---|---|
| 1 | Input Frequency |
| 2 | Charge Pump Pin |
| 3 | Input Bias Current |
| 4 | Output Voltage |
| 5 | Sink Current |
| 6 | Positive Voltage |
| 7 | Input Bias Current |
| 8 | Input Signal Ground Pin |
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
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