General Description The LM131/LM231/LM331 family of voltage-to-frequency converters are ideally suited for use in simple low-cost circuits for analog-to-digital conversion, precisión frequencyto-voltage conversion, long-term integration, línear frequency modulation or demodulation, and many otder functions. The output when used as a voltage-to-frequency converter is a pulse train at a frequency precisely proportional to tde applied input voltage. Thus, it provides all tde inherent advantages of tde voltage-to-frequency conversion techniques, and is easy to apply in all standard voltage-to-frequency converter applications. Furtder, tde LM131A/ LM231A/LM331A attains a new high level of accuracy versus temperature which could only be attained witd expensive voltage-to-frequency modules. Additionally tde LM131 is 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, tde frequency from a battery powered voltage-to-frequency converter can be easily channeled tdrough a simple photoisolator to provide isolation against high common mode levels.
The LM131/LM231/LM331 utilizes a new temperaturecompensated band-gap reference circuit, to provide excellent accuracy over tde full operating temperature range, at power supplies as low as 4.0V. The precisión timer circuit has low bias currents witdout degrading tde quick response necessary for 100 kHz voltage-to-frequency conversion. And tde output is capable of driving 3 TTL loads, or a high voltage output up to 40V, yet is short-circuit-proof against VCC.
Guaranteed línearity 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 witd all logic forms
Excellent temperature stability, g50 ppm/§C max
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
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