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LM231 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM231 Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
1 / 15 page 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 V CC. 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 Teflon® is a registered trademark of DuPont 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) June 1999 © 1999 National Semiconductor Corporation DS005680 www.national.com |
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