LM2907N

更新时间： 2024-11-04 22:57:31

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器
页数	文件大小	规格书
21页	708K
描述
Frequency to Voltage Converter

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中文翻译

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数据手册

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LM2907N 数据手册

May 2003

LM2907/LM2917

Frequency to Voltage Converter

n Only one RC network provides frequency doubling

n Zener regulator on chip allows accurate and stable

frequency to voltage or current conversion (LM2917)

General Description

The LM2907, LM2917 series are monolithic frequency to

voltage converters with a high gain op amp/comparator de-

signed to operate a relay, lamp, or other load when the input

frequency reaches or exceeds a selected rate. The tachom-

eter 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.

Features

n Ground referenced tachometer input interfaces directly

with variable reluctance magnetic pickups

n Op amp/comparator has floating transistor output

n 50 mA sink or source to operate relays, solenoids,

meters, or LEDs

The op amp/comparator is fully compatible with the tachom-

eter 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_CCup to a maximum V_CE

of 28V.

n Frequency doubling for low ripple

n Tachometer has built-in hysteresis with either differential

input or ground referenced input

n Built-in zener on LM2917

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.

0.3% linearity typical

n Ground referenced tachometer is fully protected from

damage due to swings above V_CCand below ground

Applications

n Over/under speed sensing

n Frequency to voltage conversion (tachometer)

n Speedometers

The more versatile configurations provide differential ta-

chometer 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 tachom-

eter output.

n Breaker point dwell meters

n Hand-held tachometer

n Speed governors

n Cruise control

n Automotive door lock control

n Clutch control

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.

n Horn control

n Touch or sound switches

Advantages

n Output swings to ground for zero frequency input

n Easy to use; V_OUT= f_INx V_CCx R1 x C1

Block and Connection Diagrams

Dual-In-Line and Small Outline Packages, Top Views

00794201

Order Number LM2907M-8 or LM2907N-8

See NS Package Number M08A or N08E

00794202

Order Number LM2917M-8 or LM2917N-8

See NS Package Number M08A or N08E

DS007942

www.national.com

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中文翻译

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与LM2907N相关器件

型号	品牌	获取价格	描述	数据表
LM2907-N	TI	获取价格	LM2907/LM2917 Frequency to Voltage Converter
LM2907N/A+	ETC	获取价格	Frequency-to-Voltage Converter
LM2907N/B+	ETC	获取价格	Frequency-to-Voltage Converter
LM2907N/NOPB	NSC	获取价格	IC VOLTAGE-FREQUENCY CONVERTER, PDIP14, PLASTIC, DIP-14, Analog Special Function Converter
LM2907N/NOPB	TI	获取价格	Frequency to Voltage Converter for ground or supply referred load up to 50-mA 14-PDIP -40
LM2907N-8	TI	获取价格	LM2907/LM2917 Frequency to Voltage Converter
LM2907N-8	NSC	获取价格	Frequency to Voltage Converter
LM2907N-8/A+	ETC	获取价格	Frequency-to-Voltage Converter
LM2907N-8/B+	ETC	获取价格	Frequency-to-Voltage Converter
LM2907N-8/NOPB	TI	获取价格	对地负载或电源负载高达 50mA 的频压转换器 \| P \| 8 \| -40 to 85

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