LM231A

更新时间： 2024-02-28 07:32:08

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
15页	371K
描述
Precision Voltage-to-Frequency Converters

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LM231A 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	SOP, SOP14,.4	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS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-G14	JESD-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 SPECIFIED	Base Number Matches：	1

In the precision circuit, an operational amplifier provides a

buffered output and also acts as a 2-pole filter. The ripple will

be less than 5 mV peak for all frequencies above 1 kHz, and

the response time will be much quicker than in Figure 6.

However, for input frequencies below 200 Hz, this circuit will

have worse ripple than Figure 6. The engineering of the filter

time-constants to get adequate response and small enough

ripple simply requires a study of the compromises to be

made. Inherently, V-to-F converter response can be fast, but

F-to-V response can not.

Typical Applications (Continued)

DETAILS OF OPERATION, FREQUENCY-TO-

VOLTAGE CONVERTERS (Figure 6 and Figure 7)

In these applications, a pulse input at f_INis differentiated by

a C-R network and the negative-going edge at pin 6 causes

the input comparator to trigger the timer circuit. Just as with

a V-to-F converter, the average current flowing out of pin 1 is

I_AVERAGEi x (1.1 R_tC_t) x f.

In the simple circuit of Figure 6, this current is filtered in the

network R_L100 kΩ and 1 µF. The ripple will be less than 10

mV peak, but the response will be slow, with a 0.1 second

time constant, and settling of 0.7 second to 0.1% accuracy.

DS005680-6

Use stable components with low temperature coefficients.

See Typical Applications section.

This resistor can be 5 kΩ or 10 kΩ for V 8V to 22V, but must be 10 kΩ for V 4.5V to 8V.

***

Use low offset voltage and low offset current op amps for A1: recommended types LF411A or LF356.

FIGURE 5. Precision Voltage-to-Frequency Converter,

100 kHz Full-Scale, 0.03% Non-Linearity

www.national.com

1...6 7 8910 11 12...15

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型号	品牌	描述	获取价格	数据表
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LM231AN/A+	ETC	Voltage-to-Frequency Converter	获取价格
LM231AN/B+	TI	IC,VOLTAGE-TO-FREQUENCY CONVERTER,BIPOLAR/JFET,DIP,8PIN	获取价格
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LM231B	SAMSUNG	2323 Middle Power LED	获取价格