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LM2917N-8 Datenblatt(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teilenummer LM2917N-8
Bauteilbeschribung  Frequency to Voltage Converter
Download  18 Pages
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2917N-8 Datenblatt(HTML) 1 Page - National Semiconductor (TI)

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TLH7942
February 1995
LM2907LM2917 Frequency to Voltage Converter
General Description
The LM2907 LM2917 series are monolithic frequency to
voltage converters with a high gain op ampcomparator 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
Output swings to ground for zero frequency input
Y
Easy to use VOUT e fIN c VCC c R1 c C1
Y
Only one RC network provides frequency doubling
Y
Zener regulator on chip allows accurate and stable fre-
quency to voltage or current conversion (LM2917)
Features
Y
Ground referenced tachometer input interfaces directly
with variable reluctance magnetic pickups
Y
Op ampcomparator has floating transistor output
Y
50 mA sink or source to operate relays solenoids me-
ters or LEDs
Y
Frequency doubling for low ripple
Y
Tachometer has built-in hysteresis with either differen-
tial input or ground referenced input
Y
Built-in zener on LM2917
Y
g
03% linearity typical
Y
Ground referenced tachometer is fully protected from
damage due to swings above VCC and below ground
Applications
Y
Overunder speed sensing
Y
Frequency to voltage conversion (tachometer)
Y
Speedometers
Y
Breaker point dwell meters
Y
Hand-held tachometer
Y
Speed governors
Y
Cruise control
Y
Automotive door lock control
Y
Clutch control
Y
Horn control
Y
Touch or sound switches
Block and Connection Diagrams Dual-In-Line and Small Outline Packages Top Views
TLH7942 – 1
Order Number LM2907M-8 or LM2907N-8
See NS Package Number M08A or N08E
TLH7942 – 2
Order Number LM2917M-8 or LM2917N-8
See NS Package Number M08A or N08E
TLH7942 – 3
Order Number LM2907N
See NS Package Number N14A
TLH7942 – 4
Order Number LM2917M or LM2917N
See NS Package Number M14A or N14A
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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