Frequency To Voltage Converter

The LM2907 LM2917 series are monolithic frequency to voltage converters with a high gain op amp Comparator designed to operate 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 in two versions (LM2907-8, LM2917-8) and its output swings to ground for a zero frequency input.
The op amp Comparator is fully compatible with the tachometer and has a floating Transistor as its output. This feature allows either a ground or supply referred load of up to 50 mA. The collector may be taken above VCC up to a maximum VCE of 28V.
The two basic configurations offered include an 8-pin device with a ground referenced tachometer input and an internal connection between the tachometer output and the op amp non-inverting input. This version is well suited for single speed or frequency switching or fully buffered frequency to voltage conversion applications.
The more versatile configurations provide differential tachometer input and uncommitted op amp inputs. With this version the tachometer input may be floated and the op amp becomes suitable for active Filter conditioning of the tachometer output.
Both of these configurations are available with an active Shunt Regulator connected across the power leads. The Regulator clamps the supply such that stable frequency to voltage and frequency to current operations are possible with any supply voltage and a suitable resistor.
By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM2917M Texas Instruments Frequency to Voltage Converter 14-SOIC -40 to 85
LM2917N-8 Texas Instruments VOLTAGE-FREQUENCY CONVERTER, PDIP8, PLASTIC, DIP-8
LM2917M/NOPB Texas Instruments Frequency to Voltage Converter 14-SOIC -40 to 85
LM2917N-8/NOPB Texas Instruments Frequency to Voltage Converter 8-PDIP -40 to 85
LM2917M-8 Texas Instruments Frequency to Voltage Converter 8-SOIC -40 to 85
LM2917MX-8/NOPB Texas Instruments Frequency to Voltage Converter 8-SOIC -40 to 85
LM2917M-8/NOPB Texas Instruments Frequency to Voltage Converter 8-SOIC -40 to 85
LM2917N/NOPB Texas Instruments Frequency to Voltage Converter 14-PDIP -40 to 85
LM2917MX/NOPB Texas Instruments Frequency to Voltage Converter 14-SOIC -40 to 85
LM2917MX Texas Instruments VOLTAGE-FREQUENCY CONVERTER, PDSO14, PLASTIC, SOIC-14
LM2917 's PackagesLM2917 's pdf datasheet
LM2917M-8 SOIC
LM2917MX-8 SOIC
LM2917M SOIC
LM2917MX SOIC
LM2917N-8 DIP
LM2917N DIP




LM2917 Pinout, Pinouts
LM2917 pinout,Pin out
This is one package pinout of LM2917,If you need more pinouts please download LM2917's pdf datasheet.

LM2917 Application circuits
LM2917 circuits
This is one application circuit of LM2917,If you need more circuits,please download LM2917's pdf datasheet.


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