LM131 National Semiconductor, LM131 Datasheet
LM131
Manufacturer Part Number
LM131
Description
Precision Voltage-to-Frequency Converters
Manufacturer
National Semiconductor
Datasheet
1.LM131.pdf
(16 pages)
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C 1995 National Semiconductor Corporation
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
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
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
Use stable components with low temperature coefficients See Typical Applications section
0 1 F or 1 F See ‘‘Principles of Operation ’’
FIGURE 1 Simple Stand-Alone Voltage-to-Frequency Converter
TL H 5680
with
Further
g
0 03% Typical Linearity (f
the LM131A
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
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
CC
Guaranteed linearity 0 01% max
Improved performance in existing voltage-to-frequency
conversion applications
Split or single supply operation
Operates on single 5V supply
Pulse output compatible with all logic forms
Excellent temperature stability
Low power dissipation 15 mW typical at 5V
Wide dynamic range 100 dB min at 10 kHz full scale
frequency
Wide range of full scale frequency 1 Hz to 100 kHz
Low cost
e
10 Hz to 11 kHz)
f
OUT
e
2 09 V
V
IN
R
R
S
L
R
1
t
C
t
g
50 ppm C max
RRD-B30M115 Printed in U S A
TL H 5680 – 1
December 1994
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