LM2907N National Semiconductor, LM2907N Datasheet

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LM2907N

Manufacturer Part Number
LM2907N
Description
IC, F/V CONVERTER, 10KHZ, 0.3%, 14-DIP
Manufacturer
National Semiconductor
Datasheet

Specifications of LM2907N

Frequency
5kHz
Linearity %
0.3%
Supply Voltage Range
28V
Digital Ic Case Style
DIP
No. Of Pins
14
Converter Type
Frequency/Voltage
Operating Temperature Range
-40°C To +85°C
Converter Function
FVC
Power Supply Requirement
Single
Single Supply Voltage (typ)
12V
Single Supply Voltage (max)
28V
Dual Supply Voltage (typ)
Not RequiredV
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
Package Type
MDIP
Leaded Process Compatible
No
Rohs Compliant
No
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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© 2008 National Semiconductor Corporation
LM2907/LM2917
Frequency to Voltage Converter
General Description
The LM2907, LM2917 series are monolithic frequency to volt-
age converters with a high gain op amp/comparator designed
to operate a relay, lamp, or other load when the input fre-
quency reaches or exceeds a selected rate. The tachometer
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 fre-
quency input.
The op amp/comparator is fully compatible with the tachome-
ter 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 V
V
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
tachometer 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 tachome-
ter 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
Connection Diagrams
Dual-In-Line and Small Outline Packages, Top Views
CE
Output swings to ground for zero frequency input
Easy to use; V
of 28V.
Order Number LM2907M-8 or LM2907N-8
See NS Package Number M08A or N08E
OUT
= f
IN
× V
CC
× R1 × C1
CC
7942
up to a maximum
794201
Features
Applications
Only one RC network provides frequency doubling
Zener regulator on chip allows accurate and stable
frequency 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, meters,
or LEDs
Frequency doubling for low ripple
Tachometer has built-in hysteresis with either differential
input or ground referenced input
Built-in zener on LM2917
±0.3% linearity typical
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
Order Number LM2917M-8 or LM2917N-8
See NS Package Number M08A or N08E
CC
and below ground
December 9, 2008
www.national.com
794202

LM2907N Summary of contents

Page 1

... R1 × C1 OUT IN CC Connection Diagrams Dual-In-Line and Small Outline Packages, Top Views Order Number LM2907M-8 or LM2907N-8 See NS Package Number M08A or N08E © 2008 National Semiconductor Corporation ■ Only one RC network provides frequency doubling ■ Zener regulator on chip allows accurate and stable ...

Page 2

... Order Number LM2907M or LM2907N See NS Package Number M14A or N14A Ordering Information Order Package Number LM2907M-8 8-Pin SOIC Narrow LM2907MX-8 8-Pin SOIC Narrow LM2907M 14-Pin SOIC Narrow LM2907MX 14-Pin SOIC Narrow LM2907N-8 8-Pin Molded DIP LM2907N 14-Pin Molded DIP LM2917M-8 8-Pin SOIC Narrow ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Supply Current (Zener Options) Collector Voltage Differential Input Voltage Tachometer Op Amp/Comparator Input Voltage Range Tachometer LM2907-8, LM2917-8 LM2907, LM2917 ...

Page 4

Note 5: Nonlinearity is defined as the deviation of V 1000 pF 68k and C2 = 0.22 mFd. Test Circuit and Waveform www.national.com (@ pin 3) for kHz from a straight line defined by the ...

Page 5

Typical Performance Characteristics Tachometer Linearity vs Temperature Total Supply Current Normalized Tachometer Output (K) vs Temperature Tachometer Linearity 794246 794240 Normalized Tachometer Output (K) 794242 5 vs Temperature 794247 Zener Voltage vs Temperature 794241 vs Temperature 794243 www.national.com ...

Page 6

Tachometer Currents I vs Supply Voltage Tachometer Linearity Amp Output Transistor Characteristics www.national.com and 794244 794248 794250 6 Tachometer Currents I and Temperature 794245 Tachometer Input Hysteresis vs Temperature 794249 ...

Page 7

Applications Information The LM2907 series of tachometer circuits is designed for minimum external part count applications and maximum ver- satility. In order to fully exploit its features and advantages let's examine its theory of operation. The first stage of oper- ...

Page 8

Typical Applications ”Speed Switch”, Load is Energized when f www.national.com Minimum Component Tachometer ≥ 2RC 794208 794209 ...

Page 9

Zener Regulated Frequency to Voltage Converter Breaker Point Dwell Meter 9 794210 794211 www.national.com ...

Page 10

I www.national.com Voltage Driven Meter Indicating Engine RPM 400 Hz or 6000 ERPM (8 Cylinder Engine) O Current Driven Meter Indicating Engine RPM = 300 Hz or 6000 ERPM (6 Cylinder Engine) O ...

Page 11

Capacitance Meter V = 1V–10V for C = 0.01 to 0.1 mFd OUT 111k) Two-Wire Remote Speed Switch 11 794214 794215 www.national.com ...

Page 12

Variable Reluctance Magnetic Pickup Buffer Circuits Precision two-shot output frequency equals twice input frequency. Pulse height = V ZENER www.national.com 100 Cycle Delay Switch 794239 12 794216 794217 ...

Page 13

Finger Touch or Contact Switch ≥ Flashing begins when f 100 Hz. IN Flash rate increases with input frequency increase beyond trip point. 794218 Flashing LED Indicates Overspeed 13 794219 794220 www.national.com ...

Page 14

Frequency to Voltage Converter with 2 Pole Butterworth Filter to Reduce Ripple Overspeed Latch www.national.com 794222 14 794221 794223 ...

Page 15

Some Frequency Switch Applications May Require Hysteresis in the Comparator Function Which can be Implemented in Several Ways 794224 794225 794227 15 794226 794228 www.national.com ...

Page 16

Changing the Output Voltage for an Input Frequency of Zero Changing Tachometer Gain Curve or Clamping the Minimum Output Voltage www.national.com 794229 794231 16 794230 794232 ...

Page 17

Anti-Skid Circuit Functions “Select-Low” Circuit “Select-High” Circuit V is proportional to the lower OUT of the two input wheel speeds. 794233 V is proportional to the higher OUT of the two input wheel speeds. 794235 “Select-Average” Circuit 17 794234 794236 ...

Page 18

Equivalent Schematic Diagram www.national.com 18 ...

Page 19

Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead (0.150 Wide) Molded Small Outline Package, JEDEC Order Number LM2907M-8 or LM2917M-8 NS Package Number M08A 19 www.national.com ...

Page 20

... Molded SO Package (M) Order Number LM2907M or LM2917M NS Package Number M14A Molded Dual-In-Line Package (N) Order Number LM2907N-8 or LM2917N-8 NS Package Number N08E 20 ...

Page 21

... Molded Dual-In-Line Package (N) Order Number LM2907N or LM2917N NS Package Number N14A 21 www.national.com ...

Page 22

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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