LM2917 Datasheet | National Semiconductor

Description The LM2907, LM2917 series are monolithic frequency to voltage converters with a high gain op amp/parator 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/parator is fully patible 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 m A. 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 unmitted op amp inputs. With this version the tachometer input may be floated and the op amp bees 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. Advantages n Output swings to ground for zero frequency input n Easy to use; VOUT = f IN x VCC x R1 x C1 n Only one RC network provides frequency doubling n Zener regulator on chip allows accurate and stable frequency to voltage or current conversion (LM2917) Features n Ground referenced tachometer input interfaces directly with variable reluctance magnetic pickups n Op amp/parator has floating transistor output n 50 m A sink or source to operate relays, solenoids, meters,...