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LM131 データシート(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM131
部品情報  Precision Voltage-to-Frequency Converters
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM131 データシート(HTML) 1 Page - National Semiconductor (TI)

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TLH5680
December 1994
LM131ALM131 LM231ALM231 LM331ALM331
Precision Voltage-to-Frequency Converters
General Description
The LM131LM231LM331 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
LM231ALM331A 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 LM131LM231LM331 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 40V The precision timer circuit
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
VCC
Features
Y
Guaranteed linearity 001% 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
Excellent temperature stability g50 ppm C max
Y
Low power dissipation 15 mW typical at 5V
Y
Wide dynamic range 100 dB min at 10 kHz full scale
frequency
Y
Wide range of full scale frequency 1 Hz to 100 kHz
Y
Low cost
Typical Applications
TLH5680 – 1
Use stable components with low temperature coefficients See Typical Applications section
fOUT e
VIN
209 V

RS
RL

1
RtCt
01mFor1mF See ‘‘Principles of Operation’’
FIGURE 1 Simple Stand-Alone Voltage-to-Frequency Converter
with g003% Typical Linearity (f e 10 Hz to 11 kHz)
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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