LM2907 Frequency To Voltage Converters IC



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 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.
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
?0.3% Linearity Typical
Ground Referenced Tachometer is Fully Protected From Damage Due to Swings Above VCC?and Below Ground
Output Swings to Ground For Zero Frequency Input
Easy to Use; VOUT?= fIN?? VCC?? R1 ? C1
Only One RC Network provides Frequency Doubling
Zener Regulator on Chip allows Accurate and Stable Frequency to Voltage or Current Conversion (LM2917)


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