LM2907-N Converter Datasheet

LM2907-N Datasheet, PDF, Equivalent


Part Number

LM2907-N

Description

Frequency to Voltage Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download LM2907-N Datasheet


LM2907-N
LM2907-N, LM2917-N
www.ti.com
SNAS555C – JUNE 2000 – REVISED MARCH 2013
LM2907/LM2917 Frequency to Voltage Converter
Check for Samples: LM2907-N, LM2917-N
FEATURES
1
2 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
VCC and Below Ground
APPLICATIONS
• 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
DESCRIPTION
The LM2907, LM2917 series are monolithic
frequency to voltage converters with a high gain op
amp/comparator 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 (LM2907-8, LM2917-8) and its output swings
to ground for a zero frequency input.
The op amp/comparator 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 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
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.
ADVANTAGES
• Output Swings to Ground For Zero Frequency
Input
• Easy to Use; VOUT = fIN × VCC × R1 × C1
• Only One RC Network provides Frequency
Doubling
• Zener Regulator on Chip allows Accurate and
Stable Frequency to Voltage or Current
Conversion (LM2917)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2013, Texas Instruments Incorporated

LM2907-N
LM2907-N, LM2917-N
SNAS555C – JUNE 2000 – REVISED MARCH 2013
PDIP and SOIC Packages, Top Views
CONNECTION DIAGRAMS
www.ti.com
Figure 1. See Package Number D0008A or P0008E Figure 2. See Package Number D0008A or P0008E
Figure 3. See Package Number D0014A or
NFF0014A
Figure 4. See Package Number D0014A or
NFF0014A
2 Submit Documentation Feedback
Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2907-N LM2917-N


Features LM2907-N, LM2917-N www.ti.com SNAS555C – JUNE 2000 – REVISED MARCH 2013 LM2907/LM2917 Frequency to Voltage Conv erter Check for Samples: LM2907-N, LM29 17-N FEATURES 1 •2 Ground Referenced Tachometer Input Interfaces Directly W ith Variable Reluctance Magnetic Pickup s • Op Amp/Comparator Has Floating Tr ansistor Output • 50 mA Sink or Sourc e to Operate Relays, Solenoids, Meters, or LEDs • Frequency Doubling For Low Ripple • Tachometer Has Built-In Hys teresis With Either Differential Input or Ground Referenced Input • Built-In Zener on LM2917 • ±0.3% Linearity T ypical • Ground Referenced Tachometer is Fully Protected From Damage Due to Swings Above VCC and Below Ground APPLI CATIONS • Over/Under Speed Sensing Frequency to Voltage Conversion (Tach ometer) • Speedometers • Breaker Po int Dwell Meters • Hand-Held Tachomet er • Speed Governors • Cruise Contr ol • Automotive Door Lock Control • Clutch Control • Horn Control • Touch or Sound Switches DESCRIPTION The LM2907, LM2917 series are mo.
Keywords LM2907-N, datasheet, pdf, etcTI, Frequency, to, Voltage, Converter, M2907-N, 2907-N, 907-N, LM2907-, LM2907, LM290, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)