Part # LM2907 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM2907 LM2917 Frequency to Voltage Converter

Part Details:

LM2907/LM2917 May 2003 LM2907/LM2917Frequency to Voltage ConverterGeneral Description n Only one RC network provides frequency doubling Frequency n Zener regulator on chip allows accurate and stable The LM2907, LM2917 series are monolithic frequency to frequency to voltage or current conversion (LM2917) voltage converters with a high gain op amp/comparator de-signed to operate a relay, lamp, or other load when the input Features frequency reaches or exceeds a selected rate. The tachom-eter uses a charge pump technique and offers frequency n Ground referenced tachometer input interfaces directly doubling for low ripple, full input protection in two versions with variable reluctance magnetic pickups (LM2907-8, LM2917-8) and its output swings to ground for a n Op amp/comparator has floating transistor output zero frequency input. to n 50 mA sink or source to operate relays, solenoids, The op amp/comparator is fully compatible with the tachom- meters, or LEDs V eter and has a floating transistor as its output. This feature n Frequency doubling for low ripple oltage allows either a ground or supply referred load of up to 50 mA. n Tachometer has built-in hysteresis with either differential The collector may be taken above V up to a maximum V CC CE input or ground referenced input of 28V. n Built-in zener on LM2917 The two basic configurations offered include an 8-pin device n ±0.3% linearity typical with a ground referenced tachometer input and an internal Converter n Ground referenced tachometer is fully protected from connection between the tachometer output and the op amp damage due to swings above V and below ground CC non-inverting input. This version is well suited for singlespeed or frequency switching or fully buffered frequency to Applications voltage conversion applications. The more versatile configurations provide differential ta- n Over/under speed sensing chometer input and uncommitted op amp inputs. With this n Frequency to voltage conversion (tachometer) version the tachometer input may be floated and the op amp n Speedometers becomes suitable for active filter conditioning of the tachom- n Breaker point dwell meters eter output.

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LM2907.pdf Datasheet