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LM231AN

更新时间： 2024-01-21 17:15:28
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
16页 281K
描述
Precision Voltage-to-Frequency Converters

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LM231AN 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
包装说明：SOP, SOP14,.4Reach Compliance Code：unknown
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.82转换器类型：VOLTAGE TO FREQUENCY CONVERTER
JESD-30 代码：R-PDSO-G14JESD-609代码：e0
最大线性误差 (EL)：0.02%功能数量：1
端子数量：14最大工作频率：0.1 MHz
最高工作温度：85 °C最低工作温度：-25 °C
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装等效代码：SOP14,.4封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：NOT SPECIFIED
电源：5 V认证状态：Not Qualified
子类别：Analog Special Function Converters最大压摆率：6 mA
最大供电电压：40 V最小供电电压：4 V
标称供电电压：5 V表面贴装：YES
技术：BIPOLAR温度等级：OTHER
端子面层：Tin/Lead (Sn/Pb)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：NOT SPECIFIEDBase Number Matches：1

LM231AN 数据手册

 浏览型号LM231AN的Datasheet PDF文件第4页浏览型号LM231AN的Datasheet PDF文件第5页浏览型号LM231AN的Datasheet PDF文件第6页浏览型号LM231AN的Datasheet PDF文件第8页浏览型号LM231AN的Datasheet PDF文件第9页浏览型号LM231AN的Datasheet PDF文件第10页 
Typical Applications (Continued)  
For best results, all the components should be stable low-  
temperature-coefficient components, such as metal-film re-  
sistors. The capacitor should have low dielectric absorption;  
depending on the temperature characteristics desired, NPO  
ceramic, polystyrene, Teflon or polypropylene are best  
suited.  
The average current fed into the op amp’s summing point  
c
c
/R . In this circuit, the voltage offset of the LM131  
(pin 2) is i  
b
(1.1 R C )  
t
f which is perfectly balanced with  
t
V
IN IN  
input comparator does not affect the offset or accuracy of  
the V-to-F converter as it does in the stand-alone V-to-F  
converter; nor does the LM131 bias current or offset cur-  
rent. Instead, the offset voltage and offset current of the  
operational amplifier are the only limits on how small the  
signal can be accurately converted. Since op amps with  
voltage offset well below 1 mV and offset currents well be-  
low 2 nA are available at low cost, this circuit is recommend-  
ed for best accuracy for small signals. This circuit also re-  
sponds immediately to any change of input signal (which a  
stand-alone circuit does not) so that the output frequency  
A capacitor C is added from pin 7 to ground to act as a  
IN  
filter for V . A value of 0.01 mF to 0.1 mF will be adequate in  
IN  
most cases; however, in cases where better filtering is re-  
quired, a 1 mF capacitor can be used. When the RC time  
constants are matched at pin 6 and pin 7, a voltage step at  
V
will cause a step change in f  
. If C is much less  
IN  
to stop momentarily.  
IN  
OUT  
OUT  
than C , a step at V may cause f  
L
IN  
A 47X resistor, in series with the 1 mF C , is added to give  
L
will be an accurate representation of V , as quickly as 2  
IN  
output pulses’ spacing can be measured.  
hysteresis effect which helps the input comparator provide  
the excellent linearity (0.03% typical).  
In the precision mode, excellent linearity is obtained be-  
cause the current source (pin 1) is always at ground poten-  
DETAIL OF OPERATION OF PRECISION V-TO-F  
CONVERTER (FIGURE 3)  
tial and that voltage does not vary with V or f  
IN  
. (In the  
OUT  
In this circuit, integration is performed by using a conven-  
tional operational amplifier and feedback capacitor, C .  
F
stand-alone V-to-F converter, a major cause of non-linearity  
is the output impedance at pin 1 which causes i to change  
When the integrator’s output crosses the nominal threshold  
level at pin 6 of the LM131, the timing cycle is initiated.  
as a function of V ).  
IN  
The circuit ofFigure 4 operates in the same way asFigure 3,  
but with the necessary changes for high speed operation.  
TL/H/5680–5  
*Use stable components with low temperature coefficients. See Typical Applications section.  
e
e
4.5V to 8V.  
**This resistor can be 5 kX or 10 kX for V  
8V to 22V, but must be 10 kX for V  
S
S
***Use low offset voltage and low offset current op amps for A1: recommended types LM108, LM308A, LF411A  
FIGURE 3. Standard Test Circuit and Applications Circuit, Precision Voltage-to-Frequency Converter  
7
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