National Semiconductor
Texas Instruments Incorporated (TI), a worldwide purveyor of semiconductor schematics and fabrications, specializes in the conception of analog integrated circuits (ICs) and intrinsic processors. Mobilizing the preeminent intellectual luminaries across the globe, TI engineers revolutions that sculpt the destiny of technology. Enabling over 100,000 patrons to transmute tomorrow's promise into today's reality, TI stands as a vanguard of transformative innovation.
View All Product from National Semiconductor■ Ground referenced tachometer input interfaces directlywith 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 differentialinput or ground referenced input■ Built-in zener on LM2917■ ±0.3% linearity typical■ Ground referenced tachometer is fully protected fromdamage due to swings above VCC and below ground
The LM2907, LM2917 series are monolithic frequency to volt-age converters with a high gain op amp/comparator designedto operate a relay, lamp, or other load when the input fre-quency reaches or exceeds a selected rate. The tachometeruses a charge pump technique and offers frequency doublingfor low ripple, full input protection in two versions (LM2907-8,LM2917-8) and its output swings to ground for a zero fre-quency input.The op amp/comparator is fully compatible with the tachome-ter and has a floating transistor as its output. This featureallows either a ground or supply referred load of up to 50 mA.The collector may be taken above VCC up to a maximumVCE of 28V.The two basic configurations offered include an 8-pin devicewith a ground referenced tachometer input and an internalconnection between the tachometer output and the op ampnon-inverting input. This version is well suited for single speedor frequency switching or fully buffered frequency to voltageconversion applications.The more versatile configurations provide differentialtachometer input and uncommitted op amp inputs. With thisversion the tachometer input may be floated and the op ampbecomes suitable for active filter conditioning of the tachome-ter output.Both of these configurations are available with an active shuntregulator connected across the power leads. The regulatorclamps the supply such that stable frequency to voltage andfrequency to current operations are possible with any supplyvoltage and a suitable resistor.
■ Over/under speed sensing■ Frequency to voltage conversion (tachometer)■ Speedometers■ Breaker point dwell meters■ Hand-held tachometer■ Speed governors■ Cruise control■ Automotive door lock control■ Clutch control■ Horn control■ Touch or sound switches794201Order Number LM2907M-8 or LM2907N-8See NS Package Number M08A or N08E794202Order Number LM2917M-8 or LM2917N-8See NS Package Number M08A or N08E© 2008 National Semiconductor Corporation7942www.national.com
TYPE | DESCRIPTION | Select all |
---|---|---|
Supplier Device Package | 8-PDIP | |
Package / Case | 8-DIP (0.300", 7.62mm) | |
Mounting Type | Through Hole | |
Linearity | ±0.3% | |
Full Scale | - | |
Frequency - Max | - | |
Type | Frequency to Voltage | |
Product Status | Active | |
Package | Bulk | |
Series | - |
National Semiconductor
Texas Instruments Incorporated (TI), a worldwide purveyor of semiconductor schematics and fabrications, specializes in the conception of analog integrated circuits (ICs) and intrinsic processors. Mobilizing the preeminent intellectual luminaries across the globe, TI engineers revolutions that sculpt the destiny of technology. Enabling over 100,000 patrons to transmute tomorrow's promise into today's reality, TI stands as a vanguard of transformative innovation.
View All Product from National SemiconductorLM2907-N FREQUENCY TO VOLTAGE CO
VOLTAGE TO FREQUENCY CONVERTER,
IC F/V CONV 10KHZ 8DIP
LM2907-N FREQUENCY TO VOLTAGE CO
LM2907-N FREQUENCY TO VOLTAGE CO
VOLTAGE TO FREQUENCY CONVERTER,
VOLTAGE TO FREQUENCY CONVERTER,
LM2917-N FREQUENCY TO VOLTAGE CO
SWITCHING REGULATOR
CONSUMER CIRCUIT, CMOS, PDSO20