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参数资料
| 型号： | LM331MWC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟专用变换器 |
| 英文描述： | VOLTAGE-FREQUENCY CONVERTER, 0.1 MHz, UUC |
| 封装： | WAFER |
| 文件页数： | 18/18页 |
| 文件大小： | 418K |
| 代理商： | LM331MWC |
Typical Applications (Continued)
DETAILS OF OPERATION, FREQUENCY-TO-
VOLTAGE CONVERTERS (
Figure 6 and Figure 7)
In these applications, a pulse input at f
IN is 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
AVERAGE = i x (1.1 RtCt)xf.
In the simple circuit of
Figure 6, this current is filtered in the
network R
L = 100 k and 1 F. 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.
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.
DS005680-6
*Use stable components with low temperature coefficients.
See Typical Applications section.
**This resistor can be 5 k
or 10 k for VS=8V to 22V, but must be 10 k for VS=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
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM331N | 功能描述:电压频率转换及频率电压转换 RoHS:否 制造商:Texas Instruments 全标度频率:4000 KHz 线性误差:+/- 1 % FSR 电源电压-最大: 电源电压-最小: 最大工作温度:+ 85 C 最小工作温度:- 25 C 安装风格:Through Hole 封装 / 箱体:PDIP-14 封装:Tube |
| LM331N | 制造商:Texas Instruments 功能描述:IC V/F CONVERTER DIP8 331 |
| LM331N/A+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-to-Frequency Converter |
| LM331N/B+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-to-Frequency Converter |
| LM331N/HALF | 制造商:Texas Instruments 功能描述:IC V/F CONVERTER DIP8 331 |
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