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TI-LM2917-N.pdf
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM2907-N
,
LM2917-N
SNAS555D –JUNE 2000–REVISED DECEMBER 2016
LM2907 and LM2917 Frequency to Voltage Converter
1
1 Features
1
• Ground Referenced Tachometer Input Interfaces
Directly With Variable Reluctance Magnetic
Pickups
• Op Amp 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
• ±0.3% Linearity (Typical)
• Ground-Referenced Tachometer is Fully Protected
From Damage Due to Swings Above V
CC
and
Below Ground
• Output Swings to Ground For Zero Frequency
Input
• Easy to Use; V
OUT
= f
IN
× V
CC
× R1 × C1
• Zener Regulator on Chip allows Accurate and
Stable Frequency to Voltage or Current
Conversion (LM2917)
2 Applications
• Over- and Under-Speed Sensing
• Frequency-to-Voltage Conversion (Tachometer)
• Speedometers
• Breaker Point Dwell Meters
• Hand-Held Tachometers
• Speed Governors
• Cruise Control
• Automotive Door Lock Control
• Clutch Control
• Horn Control
• Touch or Sound Switches
3 Description
The LM2907 and LM2917 devices are monolithic
frequency-to-voltage converters with a high gain op
amp designed to operate a relay, lamp, or other load
when the input frequency 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 (8-pin
LM2907 and LM2917), and its output swings to
ground for a zero frequency input.
The op amp is fully compatible with the tachometer
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
CC
up to a
maximum V
CE
of 28 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 noninverting input. This
version is well suited for single speed or frequency
switching or fully buffered frequency-to-voltage
conversion applications.
Device Information
(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
LM2907-N,
LM2917-N
PDIP (8) 6.35 mm × 9.81 mm
PDIP (14) 6.35 mm × 19.177 mm
SOIC (8) 3.91 mm × 4.90 mm
SOIC (14) 3.91 mm × 8.65 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Minimum Component Tachometer Diagram
2
LM2907-N
,
LM2917-N
SNAS555D –JUNE 2000–REVISED DECEMBER 2016
www.ti.com
Product Folder Links: LM2907-N LM2917-N
Submit Documentation Feedback Copyright © 2000–2016, Texas Instruments Incorporated
Table of Contents
1 Features.................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Description (continued)......................................... 3
6 Pin Configuration and Functions......................... 3
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information.................................................. 6
7.5 Electrical Characteristics........................................... 6
7.6 Typical Characteristics.............................................. 7
8 Parameter Measurement Information .................. 9
9 Detailed Description............................................ 10
9.1 Overview ................................................................. 10
9.2 Functional Block Diagram ....................................... 11
9.3 Feature Description................................................. 11
9.4 Device Functional Modes........................................ 12
10 Application and Implementation........................ 13
10.1 Application Information.......................................... 13
10.2 Typical Applications .............................................. 14
11 Power Supply Recommendations ..................... 27
12 Layout................................................................... 28
12.1 Layout Guidelines ................................................. 28
12.2 Layout Example .................................................... 28
13 Device and Documentation Support ................. 29
13.1 Related Links ........................................................ 29
13.2 Receiving Notification of Documentation Updates 29
13.3 Community Resources.......................................... 29
13.4 Trademarks........................................................... 29
13.5 Electrostatic Discharge Caution............................ 29
13.6 Glossary................................................................ 29
14 Mechanical, Packaging, and Orderable
Information ........................................................... 29
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (March 2013) to Revision D Page
• Added Device Information table, Pin Configuration and Functions section, ESD Ratings table, Recommended
Operating Conditions table, Thermal Information table, Parameter Measurement Information section, Detailed
Description section, Application and Implementation section, Power Supply Recommendations section, Layout
section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section...... 1
• Deleted Built-In Zener on LM2917 from Features.................................................................................................................. 1
• Deleted Only One RC Network Provides Frequency Doubling from Features ....................................................................... 1
• Added Thermal Information table ........................................................................................................................................... 6
• Changed tablenote text From: C2 = 0.22 mFd To: C2 = 0.22 µF .......................................................................................... 6
Changes from Revision B (March 2013) to Revision C Page
• Changed layout of National Semiconductor Data Sheet to TI format .................................................................................... 1
1TACH+ 8 TACH±/GND
2CP1 7 IN±
3CP2/IN+ 6 V+
4EMIT 5 COL
Not to scale
3
LM2907-N
,
LM2917-N
www.ti.com
SNAS555D –JUNE 2000–REVISED DECEMBER 2016
Product Folder Links: LM2907-N LM2917-N
Submit Documentation FeedbackCopyright © 2000–2016, Texas Instruments Incorporated
5 Description (continued)
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
tachometer 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.
6 Pin Configuration and Functions
P and D Package
8-Pin PDIP and SOIC
Top View
Pin Functions: 8 Pins
PIN
I/O DESCRIPTION
NAME NO.
COL 5 I The collector of the bipolar junction transistor
CP1 2 O
A capacitor placed on this pin will be charged up to V
CC
/2 by a constant current source of 180 µA
typical at the start of every positive half cycle. At the beginning of negative half cycles this capacitor
is discharged the same amount at the same rate.
CP2/IN+ 3 I/O
See pins CP1 and IN+. On 8-pin devices (8-pin LM2907 and LM2917) these two nodes share a pin
and are internally connected.
EMIT 4 O The emitter of the bipolar junction transistor
GND — G Ground
IN+ — I The noninverting input to the high gain op amp
IN– 7 I The inverting input to the high gain op amp
NC — — No connect
TACH+ 1 I
Positive terminal for the input signal that leads to the noninverting terminal of the internal Schmitt-
Trigger comparator.
TACH–/GND 8 I
Negative terminal for the input signal that leads to the noninverting terminal of the internal Schmitt-
Trigger comparator. (NOTE: On 8-pin devices, LM2907 and LM2917, this pin is internally connected
to ground and must be tied to ground externally to provide the reference voltage of the device).
V+ 6 I Supply voltage
1TACH+ 14 NC
2CP1 13 NC
3CP2 12 GND
4IN+ 11 TACH±
5EMIT 10 IN±
6NC 9 V+
7NC 8 COL
Not to scale
4
LM2907-N
,
LM2917-N
SNAS555D –JUNE 2000 –REVISED DECEMBER 2016
www.ti.com
Product Folder Links: LM2907-N LM2917-N
Submit Documentation Feedback Copyright © 2000–2016, Texas Instruments Incorporated
NFF and D Package
14-Pin PDIP and SOIC
Top View
Pin Functions: 14 Pins
PIN
I/O DESCRIPTION
NAME NO.
COL 8 I The collector of the bipolar junction transistor
CP1 2 O
A capacitor placed on this pin will be charged up to V
CC
/2 by a constant current source of 180 µA
typical at the start of every positive half cycle. At the beginning of negative half cycles this capacitor is
discharged the same amount at the same rate.
CP2 3 O
The charge pump sources current out of this pin equal to the absolute value of the capacitor current
on CP1. A resistor and capacitor in parallel connected to this pin filters the current pulses into the
output voltage.
EMIT 5 O The emitter of the bipolar junction transistor
GND 12 G Ground
IN+ 4 I The noninverting input to the high gain op amp
IN– 10 I The inverting input to the high gain op amp
NC 6, 7, 13, 14 — No connect
TACH+ 1 I
Positive terminal for the input signal that leads to the noninverting terminal of the internal Schmitt-
Trigger comparator.
TACH– 11 I
Negative terminal for the input signal that leads to the noninverting terminal of the internal Schmitt-
Trigger comparator.
V+ 9 I Supply voltage
5
LM2907-N
,
LM2917-N
www.ti.com
SNAS555D –JUNE 2000–REVISED DECEMBER 2016
Product Folder Links: LM2907-N LM2917-N
Submit Documentation FeedbackCopyright © 2000–2016, Texas Instruments Incorporated
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
7 Specifications
7.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
(1)(2)
MIN MAX UNIT
Supply voltage 28 V
Supply current (Zener options) 25 mA
Collector voltage 28 V
Differential input voltage Tachometer, op amp, and comparator 28 V
Input voltage
Tachometer
LM2907 (8), LM2917 (8) –28 28
VLM2907 (14), LM2917 (14) 0 28
Op amp and comparator 0 28
Power dissipation
LM29x7 (8) 1200
mW
LM29x7 (14) 1580
Soldering information
PDIP package Soldering (10 s) 260
°C
SOIC package
Vapor phase (60 s) 215
Infrared (15 s) 220
Operating temperature, T
J
–40 85 °C
Storage temperature, T
stg
–65 150 °C
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
7.2 ESD Ratings
VALUE UNIT
V
(ESD)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JESD22-A114
(1)
±1000
V
Charged-device model (CDM), per JEDEC specification JESD22-C101
(2)
±250
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
Input voltage
LM2907 (8), LM2917 (8) –28 28 V
LM2907 (14), LM2917 (14) 0 28 V
Output sink current 50 mA
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