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PDF LM231A Data sheet ( Hoja de datos )
| Número de pieza | LM231A | |
| Descripción | Precision Voltage-to-Frequency Converters | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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
1 page  
Typical Performance Characteristics
(All electrical characteristics apply for the circuit of Figure 4, unless otherwise noted.)
Nonlinearity Error
as Precision V-to-F
Converter (Figure 4)
Nonlinearity Error
Nonlinearity Error vs Power
Supply Voltage
DS005680-25
Frequency vs Temperature
DS005680-26
VREF vs Temperature
DS005680-27
Output Frequency vs
VSUPPLY
DS005680-28
100 kHz Nonlinearity Error
(Figure 5)
Nonlinearity Error
(Figure 1)
DS005680-29
DS005680-30
Input Current (Pins 6,7) vs
Temperature
DS005680-31
DS005680-32
DS005680-33
5 www.national.com
5 Page 
Typical Applications (Continued)
Long-Term Digital Integrator Using VFC
Basic Analog-to-Digital Converter Using
Voltage-to-Frequency Converter
DS005680-11
Analog-to-Digital Converter with Microprocessor
DS005680-12
DS005680-13
Remote Voltage-to-Frequency Converter with 2-Wire Transmitter and Receiver
DS005680-14
11 www.national.com
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LM231A.PDF ] | |
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