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LM2907M датащи(PDF) 1 Page - Texas Instruments

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номер детали LM2907M
подробное описание детали  Frequency to Voltage Converter
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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LM2907M датащи(HTML) 1 Page - Texas Instruments

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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
1
FEATURES
DESCRIPTION
The
LM2907,
LM2917
series
are
monolithic
2
Ground Referenced Tachometer Input
frequency to voltage converters with a high gain op
Interfaces Directly With Variable Reluctance
amp/comparator designed to operate a relay, lamp, or
Magnetic Pickups
other load when the input frequency reaches or
Op Amp/Comparator Has Floating Transistor
exceeds a selected rate. The tachometer uses a
Output
charge
pump
technique
and
offers
frequency
doubling for low ripple, full input protection in two
50 mA Sink or Source to Operate Relays,
versions (LM2907-8, LM2917-8) and its output swings
Solenoids, Meters, or LEDs
to ground for a zero frequency input.
Frequency Doubling For Low Ripple
The op amp/comparator is fully compatible with the
Tachometer Has Built-In Hysteresis With
tachometer and has a floating transistor as its output.
Either Differential Input or Ground Referenced
This feature allows either a ground or supply referred
Input
load of up to 50 mA. The collector may be taken
Built-In Zener on LM2917
above VCC up to a maximum VCE of 28V.
±0.3% Linearity Typical
The two basic configurations offered include an 8-pin
Ground Referenced Tachometer is Fully
device with a ground referenced tachometer input
Protected From Damage Due to Swings Above
and an internal connection between the tachometer
output and the op amp non-inverting input. This
VCC and Below Ground
version is well suited for single speed or frequency
switching or fully buffered frequency to voltage
APPLICATIONS
conversion applications.
Over/Under Speed Sensing
The more versatile configurations provide differential
Frequency to Voltage Conversion
tachometer input and uncommitted op amp inputs.
(Tachometer)
With this version the tachometer input may be floated
Speedometers
and the op amp becomes suitable for active filter
conditioning of the tachometer output.
Breaker Point Dwell Meters
Hand-Held Tachometer
Both of these configurations are available with an
active shunt regulator connected across the power
Speed Governors
leads. The regulator clamps the supply such that
Cruise Control
stable frequency to voltage and frequency to current
Automotive Door Lock Control
operations are possible with any supply voltage and a
suitable resistor.
Clutch Control
Horn Control
Touch or Sound Switches
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.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2000–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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