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LM131A データシート(PDF) 1 Page - National Semiconductor (TI) |
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LM131A データシート(HTML) 1 Page - National Semiconductor (TI) |
1 / 16 page 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 |
同様の部品番号 - LM131A |
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同様の説明 - LM131A |
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