LM2917N
Frequency to Voltage Converter
Advantages
Output swings to ground for zero frequency input
Easy to use; VOUT= f
IN x VCC x R1 x C1
Only one RC network provides frequency doubling
Zener regulator ochip allows accurate and stable
frequency to voltage or current conversio(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-ihysteresis with either differential
input or ground referenced input
Built-izener oLM2917
±0.3% linearity typical
Ground referenced tachometer is fully protected from
damage due to swings above VCC and below ground
Applications
Over/under speed sensing
Frequency to voltage conversio(tachometer)
Speedometers
Breaker point dwell meters
Hand-held tachometer
Speed governors
Cruise control
Automotive door lock control
Clutch control
Horcontrol
Touch or sound switches
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