Part # LM2907EP datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM2907EP LM2917EP Enhanced Plastic Frequency to Voltage Converter

Part Details:

LM2907EP/LM2917EP June 2004 LM2907EP/LM2917EPEnhanced Plastic Frequency to Voltage ConverterGeneral Description Features The LM2907EP, LP2917EP series are monolithic frequency n Ground referenced tachometer input interfaces directly to voltage converters with a high gain op amp/comparator with variable reluctance magnetic pickups designed to operate a relay, lamp, or other load when the n Op amp/comparator has floating transistor output input frequency reaches or exceeds a selected rate. The Enhanced n 50 mA sink or source to operate relays, solenoids, tachometer uses a charge pump technique and offers fre- meters, or LEDs quency doubling for low ripple, full input protection in two n Frequency doubling for low ripple versions (LM2907-8EP, LM2917-8EP) and its output swings n Tachometer has built-in hysteresis with either differential to ground for a zero frequency input. input or ground referenced input The op amp/comparator is fully compatible with the tachom- n Built-in zener on LM2917EP eter and has a floating transistor as its output. This feature n ±0.3% linearity typical allows either a ground or supply referred load of up to 50 mA. Plastic n Ground referenced tachometer is fully protected from The collector may be taken above V up to a maximum V CC CE damage due to swings above V and below ground of 28V. CC The two basic configurations offered include an 8-pin device Advantages with a ground referenced tachometer input and an internalconnection between the tachometer output and the op amp n Output swings to ground for zero frequency input Frequency non-inverting input. This version is well suited for single n Easy to use; V = f x V x R1 x C1 OUT IN CC speed or frequency switching or fully buffered frequency to n Only one RC network provides frequency doubling voltage conversion applications. n Zener regulator on chip allows accurate and stable The more versatile configurations provide differential ta- frequency to voltage or current conversion (LM2917EP)

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LM2907EP.pdf Datasheet