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LM2907MX-8/NOPB PDF预览

LM2907MX-8/NOPB

更新时间： 2024-09-28 21:18:03
品牌 Logo 应用领域
美国国家半导体 - NSC 光电二极管转换器
页数 文件大小 规格书
22页 490K
描述
IC VOLTAGE-FREQUENCY CONVERTER, PDSO8, 0.150 INCH, PLASTIC, SOIC-8, Analog Special Function Converter

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LM2907MX-8/NOPB 技术参数

是否Rohs认证： 符合生命周期：Transferred
包装说明：SOP, SO8(UNSPEC)Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.16转换器类型：VOLTAGE TO FREQUENCY CONVERTER
JESD-30 代码：R-PDSO-G8JESD-609代码：e3
长度：4.9 mm最大线性误差 (EL)：1%
湿度敏感等级：1功能数量：1
端子数量：8最高工作温度：85 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装等效代码：SO8(UNSPEC)
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：260电源：12 V
认证状态：Not Qualified座面最大高度：1.75 mm
子类别：Analog Special Function Converters最大压摆率：6 mA
标称供电电压：12 V表面贴装：YES
技术：BIPOLAR温度等级：INDUSTRIAL
端子面层：Matte Tin (Sn)端子形式：GULL WING
端子节距：1.27 mm端子位置：DUAL
处于峰值回流温度下的最长时间：40宽度：3.9 mm
Base Number Matches：1

LM2907MX-8/NOPB 数据手册

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December 9, 2008  
LM2907/LM2917  
Frequency to Voltage Converter  
Only one RC network provides frequency doubling  
■
General Description  
Zener regulator on chip allows accurate and stable  
frequency to voltage or current conversion (LM2917)  
■
The LM2907, LM2917 series are monolithic frequency to volt-  
age converters with a high gain op amp/comparator designed  
to operate a relay, lamp, or other load when the input fre-  
Features  
quency 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 fre-  
quency input.  
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  
The op amp/comparator is fully compatible with the tachome-  
ter 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.  
■
■
Tachometer has built-in hysteresis with either differential  
input or ground referenced input  
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  
Ground referenced tachometer is fully protected from  
damage due to swings above VCC and below ground  
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 tachome-  
ter output.  
Over/under speed sensing  
■
■
■
■
■
■
■
■
Frequency to voltage conversion (tachometer)  
Speedometers  
Breaker point dwell meters  
Hand-held tachometer  
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.  
Speed governors  
Cruise control  
Automotive door lock control  
Clutch control  
■
■
■
Horn control  
Advantages  
Touch or sound switches  
Output swings to ground for zero frequency input  
■
Easy to use; VOUT = fIN × VCC × R1 × C1  
■
Connection Diagrams  
Dual-In-Line and Small Outline Packages, Top Views  
Order Number LM2907M-8 or LM29077N94-2801  
See NS Package Number M08A or N08E  
Order Number LM2917M-8 or LM2917N-8  
See NS Package Number M08A or N08E  
794202  
© 2008 National Semiconductor Corporation  
7942  
www.national.com  
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