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National Semiconductor Electronic Components Datasheet

LM231A Datasheet

Precision Voltage-to-Frequency Converters

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LM231A pdf
June 1999
LM231A/LM231/LM331A/LM331
Precision Voltage-to-Frequency Converters
General Description
The LM231/LM331 family of voltage-to-frequency converters
are ideally suited for use in simple low-cost circuits for
analog-to-digital conversion, precision frequency-to-voltage
conversion, long-term integration, linear frequency modula-
tion 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 in-
put voltage. Thus, it provides all the inherent advantages of
the voltage-to-frequency conversion techniques, and is easy
to apply in all standard voltage-to-frequency converter appli-
cations. Further, the LM231A/LM331A attain a new high
level of accuracy versus temperature which could only be at-
tained with expensive voltage-to-frequency modules. Addi-
tionally the LM231/331 are ideally suited for use in digital
systems at low power supply voltages and can provide
low-cost
analog-to-digital
conversion
in
microprocessor-controlled systems. And, the frequency from
a battery powered voltage-to-frequency converter can be
easily channeled through a simple photoisolator to provide
isolation against high common mode levels.
The LM231/LM331 utilize a new temperature-compensated
band-gap reference circuit, to provide excellent accuracy
over the full operating temperature range, at power supplies
as low as 4.0V. The precision timer circuit has low bias cur-
rents without degrading the quick response necessary for
100 kHz voltage-to-frequency conversion. And the output
are capable of driving 3 TTL loads, or a high voltage output
up to 40V, yet is short-circuit-proof against VCC.
Features
n Guaranteed linearity 0.01% max
n Improved performance in existing voltage-to-frequency
conversion applications
n Split or single supply operation
n Operates on single 5V supply
n Pulse output compatible with all logic forms
n Excellent temperature stability, ±50 ppm/˚C max
n Low power dissipation, 15 mW typical at 5V
n Wide dynamic range, 100 dB min at 10 kHz full scale
frequency
n Wide range of full scale frequency, 1 Hz to 100 kHz
n Low cost
Typical Applications
DS005680-1
*Use stable components with low temperature coefficients. See Typical Applications section.
**0.1µF or 1µF, See “Principles of Operation.”
FIGURE 1. Simple Stand-Alone Voltage-to-Frequency Converter
with ±0.03% Typical Linearity (f = 10 Hz to 11 kHz)
Teflon® is a registered trademark of DuPont
© 1999 National Semiconductor Corporation DS005680
www.national.com


National Semiconductor Electronic Components Datasheet

LM231A Datasheet

Precision Voltage-to-Frequency Converters

No Preview Available !

LM231A pdf
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Output Short Circuit to Ground
Output Short Circuit to VCC
Input Voltage
Operating Ambient Temperature Range
Power Dissipation (PD at 25˚C)
and Thermal Resistance (θjA)
(N Package) PD
θjA
Lead Temperature (Soldering, 10 sec.)
Dual-In-Line Package (Plastic)
ESD Susceptibility (Note 4)
N Package
LM231A/LM231
40V
Continuous
Continuous
−0.2V to +VS
TMIN
TMAX
−25˚C to +85˚C
1.25W
100˚C/W
260˚C
500V
LM331A/LM331
40V
Continuous
Continuous
−0.2V to +VS
TMIN
TMAX
0˚C to +70˚C
1.25W
100˚C/W
260˚C
500V
Electrical Characteristics
TA=25˚C unless otherwise specified (Note 2)
Parameter
Conditions
VFC Non-Linearity (Note 3)
4.5V VS 20V
TMIN TA TMAX
VFC Non-Linearity
In Circuit of Figure 1
Conversion Accuracy Scale Factor (Gain)
LM231, LM231A
LM331, LM331A
Temperature Stability of Gain
LM231/LM331
LM231A/LM331A
Change of Gain with VS
Rated Full-Scale Frequency
Gain Stability vs Time
(1000 Hrs)
Overrange (Beyond Full-Scale) Frequency
INPUT COMPARATOR
Offset Voltage
LM231/LM331
LM231A/LM331A
Bias Current
Offset Current
Common-Mode Range
TIMER
Timer Threshold Voltage, Pin 5
Input Bias Current, Pin 5
All Devices
LM231/LM331
LM231A/LM331A
VS = 15V, f = 10 Hz to 11 kHz
VIN = −10V, RS = 14 k
TMIN TA TMAX, 4.5V VS 20V
4.5V VS 10V
10V VS 40V
VIN = −10V
TMIN TA TMAX
VIN = −11V
TMIN TA TMAX
TMIN TA TMAX
TMIN TA TMAX
VS = 15V
0V VPIN 5 9.9V
VPIN 5 = 10V
VPIN 5 = 10V
Min Typ
±0.003
±0.006
±0.024
Max
±0.01
±0.02
±0.14
Units
% Full-
Scale
% Full-
Scale
%Full-
Scale
0.95
0.90
1.00
1.00
1.05
1.10
kHz/V
kHz/V
±30
±20
0.01
0.006
10.0
±0.02
10
±150
±50
0.1
0.06
ppm/˚C
ppm/˚C
%/V
%/V
kHz
% Full-
Scale
%
−0.2
0.63
±3
±4
±3
−80
±8
0.667
±10
200
200
±10
±14
±10
−300
±100
VCC−2.0
mV
mV
mV
nA
nA
V
0.70
x VS
±100
1000
500
nA
nA
nA
www.national.com
2


Part Number LM231A
Description Precision Voltage-to-Frequency Converters
Maker National Semiconductor
Total Page 15 Pages
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