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LM331

更新时间： 2024-11-11 22:51:55
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Precision Voltage-to-Frequency Converters

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December 1994  
LM131A/LM131, LM231A/LM231, LM331A/LM331  
Precision Voltage-to-Frequency Converters  
General Description  
The LM131/LM231/LM331 family of voltage-to-frequency  
converters are ideally suited for use in simple low-cost cir-  
cuits for analog-to-digital conversion, precision frequency-  
to-voltage conversion, long-term integration, linear frequen-  
cy modulation or demodulation, and many other functions.  
The output when used as a voltage-to-frequency converter  
is a pulse train at a frequency precisely proportional to the  
applied input voltage. Thus, it provides all the inherent ad-  
vantages of the voltage-to-frequency conversion tech-  
niques, and is easy to apply in all standard voltage-to-fre-  
quency converter applications. Further, the LM131A/  
LM231A/LM331A attains a new high level of accuracy ver-  
sus temperature which could only be attained with expen-  
sive voltage-to-frequency modules. Additionally the LM131  
is ideally suited for use in digital systems at low power sup-  
ply voltages and can provide low-cost analog-to-digital con-  
version in microprocessor-controlled systems. And, the fre-  
quency from a battery powered voltage-to-frequency con-  
verter can be easily channeled through a simple photoisola-  
tor to provide isolation against high common mode levels.  
has low bias currents without degrading the quick response  
necessary for 100 kHz voltage-to-frequency conversion.  
And the output is capable of driving 3 TTL loads, or a high  
voltage output up to 40V, yet is short-circuit-proof against  
V
CC  
.
Features  
Y
Guaranteed linearity 0.01% max  
Y
Improved performance in existing voltage-to-frequency  
conversion applications  
Y
Split or single supply operation  
Y
Operates on single 5V supply  
Y
Pulse output compatible with all logic forms  
Y
g
Excellent temperature stability, 50 ppm/ C max  
§
Y
Y
Low power dissipation, 15 mW typical at 5V  
Wide dynamic range, 100 dB min at 10 kHz full scale  
frequency  
Y
Y
Wide range of full scale frequency, 1 Hz to 100 kHz  
Low cost  
The LM131/LM231/LM331 utilizes  
a new temperature-  
compensated band-gap reference circuit, to provide excel-  
lent accuracy over the full operating temperature range, at  
power supplies as low as 4.0V. The precision timer circuit  
Typical Applications  
V
R
1
TL/H/5680–1  
IN  
S
e
f
#
#
OUT  
2.09 V  
R
R C  
t t  
L
*Use stable components with low temperature coefficients. See Typical Applications section.  
**0.1mF or 1mF, See ‘‘Principles of Operation.’’  
FIGURE 1. Simple Stand-Alone Voltage-to-Frequency Converter  
e
g
with 0.03% Typical Linearity (f  
10 Hz to 11 kHz)  
C
1995 National Semiconductor Corporation  
TL/H/5680  
RRD-B30M115/Printed in U. S. A.  
1234567...16

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