LM2907EP Converter Datasheet

LM2907EP Datasheet, PDF, Equivalent


Part Number

LM2907EP

Description

Enhanced Plastic Frequency to Voltage Converter

Manufacture

etcTI

Total Page 21 Pages
Datasheet
Download LM2907EP Datasheet


LM2907EP
OBSOLETE
LM2907EP, LM2917EP
www.ti.com
SNOSAB0A – JUNE 2004 – REVISED SEPTEMBER 2011
LM2907EP /LM2917EP Enhanced Plastic Frequency to Voltage Converter
Check for Samples: LM2907EP, LM2917EP
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 LM2917EP
• ±0.3% linearity typical
• Ground referenced tachometer is fully
protected from damage due to swings above
VCC and below ground
APPLICATIONS
• Selected Military Applications
• Selected Avionics Applications
DESCRIPTION
The LM2907EP, LP2917EP 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 (LM2907-8EP, LM2917-8EP) 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.
ENHANCED PLASTIC
• Extended Temperature Performance of 40°C to +85°C
• Baseline Control - Single Fab & Assembly Site
• Process Change Notification (PCN)
• Qualification & Reliability Data
• Solder (PbSn) Lead Finish is standard
• Enhanced Diminishing Manufacturing Sources (DMS) Support
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 (LM2917EP)
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 © 2004–2011, Texas Instruments Incorporated

LM2907EP
LM2907EP, LM2917EP
OBSOLETE
SNOSAB0A – JUNE 2004 – REVISED SEPTEMBER 2011
Block and Connection Diagrams
Dual-In-Line and Small Outline Packages, Top Views
www.ti.com
Figure 1. LM2907-8
Figure 2. LM2917-8
Figure 3. LM2907
Figure 4. LM2917
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2 Submit Documentation Feedback
Copyright © 2004–2011, Texas Instruments Incorporated
Product Folder Links: LM2907EP LM2917EP


Features OBSOLETE LM2907EP, LM2917EP www.ti.com SNOSAB0A – JUNE 2004 – REVISED SE PTEMBER 2011 LM2907EP /LM2917EP Enhanc ed Plastic Frequency to Voltage Convert er Check for Samples: LM2907EP, LM2917E P FEATURES 1 •2 Ground referenced ta chometer input interfaces directly with variable reluctance magnetic pickups Op amp/comparator has floating trans istor output • 50 mA sink or source t o operate relays, solenoids, meters, or LEDs • Frequency doubling for low ri pple • Tachometer has built-in hyster esis with either differential input or ground referenced input • Built-in z ener on LM2917EP • ±0.3% linearity t ypical • Ground referenced tachometer is fully protected from damage due to swings above VCC and below ground APPLI CATIONS • Selected Military Applicati ons • Selected Avionics Applications DESCRIPTION The LM2907EP, LP2917EP ser ies are monolithic frequency to voltage converters with a high gain op amp/com parator designed to operate a relay, lamp, or other load when the input frequency reache.
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