LM2917 National Semiconductor, LM2917 Datasheet
LM2917
Manufacturer Part Number
LM2917
Description
LM2907/LM2917 Frequency to Voltage Converter
Manufacturer
National Semiconductor
Datasheet
1.LM2917.pdf
(18 pages)
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C 1995 National Semiconductor Corporation
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
Advantages
Y
Y
Y
Y
Features
Y
Y
Y
Block and Connection Diagrams
Output swings to ground for zero frequency input
Easy to use V
Only one RC network provides frequency doubling
Zener regulator on chip allows accurate and stable fre-
quency to voltage or current conversion (LM2917)
Ground referenced tachometer input interfaces directly
with variable reluctance magnetic pickups
Op amp comparator has floating transistor output
50 mA sink or source to operate relays solenoids me-
ters or LEDs
Order Number LM2907M-8 or LM2907N-8
See NS Package Number M08A or N08E
See NS Package Number N14A
Order Number LM2907N
OUT
e
f
IN c
TL H 7942
V
CC c
R1
c
C1
TL H 7942– 1
TL H 7942– 3
Dual-In-Line and Small Outline Packages Top Views
Y
Y
Y
Y
Y
Applications
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Frequency doubling for low ripple
Tachometer has built-in hysteresis with either differen-
tial input or ground referenced input
Built-in zener on LM2917
Ground referenced tachometer is fully protected from
damage due to swings above V
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 switches
g
0 3% linearity typical
Order Number LM2917M-8 or LM2917N-8
See NS Package Number M08A or N08E
See NS Package Number M14A or N14A
Order Number LM2917M or LM2917N
CC
and below ground
RRD-B30M115 Printed in U S A
February 1995
TL H 7942 – 2
TL H 7942 – 4
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