LM231, LM331

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SNOSBI2C – JUNE 1999 – REVISED SEPTEMBER 2015

5 Description continued

Further, the LMx31A attain a new high level of accuracy versus temperature which could only be attained with

expensive voltage-to-frequency modules. Additionally the LMx31 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 photo isolator to provide isolation against high common-mode levels.

The LMx31 uses 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 V. The precision timer circuit has low bias

currents 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 40 V, yet is short-circuit-proof against

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