Precision Voltage-to-frequency Converters -

The LM131 LM231 LM331 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 LM231A LM331A 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 LM131 LM231 LM331 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 4.0V. 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. By National Semiconductor Corporation
LM131 's PackagesLM131 's pdf datasheet
LM131A
LM231A
LM331A




LM131 Pinout, Pinouts
LM131 pinout,Pin out
This is one package pinout of LM131,If you need more pinouts please download LM131's pdf datasheet.

LM131 Application circuits
LM131 circuits
This is one application circuit of LM131,If you need more circuits,please download LM131's pdf datasheet.


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