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LM2917P

更新时间： 2024-11-29 12:46:31
品牌 Logo 应用领域
德州仪器 - TI 转换器
页数 文件大小 规格书
7页 96K
描述
FREQUENCY-TO-VOLTAGE CONVERTERS

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LM2917P 数据手册

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LM2907, LM2917  
FREQUENCY-TO-VOLTAGE CONVERTERS  
SLFS011A – MARCH 1986 – REVISED JULY 1993  
LM2907, LM2917 . . . D OR P PACKAGE  
(TOP VIEW)  
Output Swings to Ground for  
Zero-Frequency Input  
Only One RC Network Provides Frequency  
Doubling for Low Ripple  
TACH+  
CAP1  
GND  
IN–  
1
2
3
4
8
7
6
5
8-Pin Versions Interface Directly to  
Variable-Reluctance Magnetic Pickups  
CPO/IN+  
E
V
CC  
C
Uncommitted Collector and Emitter  
Outputs Provide 40-mA Sink or Source  
Current to Operate Relays, Solenoids,  
Meters, or LEDs  
LM2907, LM2917 . . . D OR N PACKAGE  
(TOP VIEW)  
TACH+  
CAP1  
CPO  
IN+  
NC  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
Built-In Hysteresis for Noise Immunity  
NC  
Linearity Typically ±0.3%  
GND  
TACH–  
IN–  
8-Pin Versions Are Fully Protected From  
Damage Due to TACH Input Swing Above  
E
V
and Below Ground  
CC  
NC  
V
CC  
NC  
8
C
applications  
NC – No internal connection  
Over/under speed sensing  
Frequency-to-voltage conversion  
Speedometers  
Breaker-point dwell meters  
Hand-held tachometers  
Speed governors  
AVAILABLE OPTIONS  
PACKAGED DEVICES  
SMALL PLASTIC PLASTIC  
T
A
OUTLINE  
(D)  
DIP  
(N)  
DIP  
(P)  
Cruise controls  
Automotive door-lock controls  
Clutch controls  
L2907D8  
L2907D14  
L2917D8  
L2917D14  
—
LM2907P  
—
LM2907N  
—
–40°C to 85°C  
LM2917P  
—
Horn controls  
LM2917N  
Touch or sound switches  
description  
The LM2907 and LM2917 are monolithic frequency-to-voltage converters. Each device has an output circuit  
that activates loads such as relays and lamps when the input frequency reaches or exceeds a selected rate.  
The converter (tachometer) section consists of a comparator driving a charge pump and offers frequency  
doubling for low ripple, full input protection in 8-pin versions, and an output swing to ground for a zero-frequency  
input. The output section consists of an operational amplifier, normally operating as a comparator, that drives  
an output transistor with both the collector and emitter floating. The circuit can either sink or source 40 mA of  
load current.  
Two basic configurations are offered: 8-pin devices and 14-pin devices. Each 8-pin version has a ground-  
referenced tachometer input and an internal connection between the tachometer output and the operational  
amplifier input. The 8-pin versions are suited to single-speed or single-frequency switching or fully buffered  
frequency-to-voltage conversion applications. The more versatile 14-pin versions provide differential  
tachometer inputs and uncommitted operational amplifier inputs. The tachometer input can be floated, and the  
operational amplifier becomes suitable for active filter conditioning of the tachometer output.  
The LM2917 has an active shunt regulator connected across the power leads. The regulator clamps the supply  
voltage so that stable frequency-to-voltage and frequency-to-current conversions are possible with any supply  
voltage and a suitable resistor.  
The LM2907 and LM2917 are designed for operation from –40°C to 85°C.  
Copyright 1993, Texas Instruments Incorporated  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567

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