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參數(shù)資料
| 型號(hào)： | LM231WM |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Precision Voltage-to-Frequency Converters |
| 中文描述： | 精密電壓到頻率轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 9/15頁(yè) |
| 文件大小： | 368K |
| 代理商： | LM231WM |
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Typical Applications
(Continued)
DETAILS OF OPERATION, FREQUENCY-TO-
VOLTAGE CONVERTERS (
Figure 6
and
Figure 7
)
In these applications, a pulse input at f
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 R
t
C
t
) x f.
In the simple circuit of Figure 6 this current is filtered in the
network R
=100 k
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.
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 V
S
=8V to 22V, but must be 10 k
for V
S
=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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