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PDF LM2917 Data sheet ( Hoja de datos )

Número de pieza LM2917
Descripción LM2907/LM2917 Frequency to Voltage Converter
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! LM2917 Hoja de datos, Descripción, Manual

June 2000
LM2907/LM2917
Frequency to Voltage Converter
General Description
The LM2907, LM2917 series are monolithic frequency to
voltage converters with a high gain op amp/comparator de-
signed to operate a relay, lamp, or other load when the input
frequency reaches or exceeds a selected rate. The tachom-
eter 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 tachom-
eter 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 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 ta-
chometer 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 tachom-
eter 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 = fIN 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/comparator has floating transistor output
n 50 mA sink or source to operate relays, solenoids,
meters, or LEDs
n Frequency doubling for low ripple
n Tachometer has built-in hysteresis with either differential
input or ground referenced input
n Built-in zener on LM2917
n ±0.3% linearity typical
n Ground referenced tachometer is fully protected from
damage due to swings above VCC and below ground
Applications
n Over/under speed sensing
n Frequency to voltage conversion (tachometer)
n Speedometers
n Breaker point dwell meters
n Hand-held tachometer
n Speed governors
n Cruise control
n Automotive door lock control
n Clutch control
n Horn control
n Touch or sound switches
Block and Connection Diagrams Dual-In-Line and Small Outline Packages, Top Views
DS007942-1
Order Number LM2907M-8 or LM2907N-8
See NS Package Number M08A or N08E
© 2000 National Semiconductor Corporation DS007942
DS007942-2
Order Number LM2917M-8 or LM2917N-8
See NS Package Number M08A or N08E
www.national.com

1 page




LM2917 pdf
Typical Performance Characteristics
Total Supply Current
Zener Voltage vs
Temperature
Normalized Tachometer
Output vs Temperature
DS007942-40
Normalized Tachometer
Output vs Temperature
DS007942-41
Tachometer Currents I2
and I3 vs Supply Voltage
DS007942-42
Tachometer Currents I2
and I3 vs Temperature
DS007942-43
Tachometer Linearity
vs Temperature
DS007942-44
Tachometer Linearity
vs Temperature
DS007942-45
Tachometer Linearity vs R1
DS007942-46
DS007942-47
DS007942-48
5 www.national.com

5 Page





LM2917 arduino
Typical Applications (Continued)
100 Cycle Delay Switch
DS007942-16
Variable Reluctance Magnetic Pickup Buffer Circuits
Precision two-shot output frequency
equals twice input frequency.
Pulse height = VZENER
DS007942-39
DS007942-17
11 www.national.com

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