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Voltage-to-frequency converter

LM331 Internal Circuitry

Explore the internal circuitry and functional stages of LM331.

Inside LM331

Reference current, comparator, timer and pulse output.

CompactLM331cutawayshowingreference,comparator,timedlatch,switchedcurrentsourceandopen-collectoroutput.
Functional architecture. External timing and integration components complete the converter.

Explore the circuit

Select a stage to see its role and connections

Reference

IREF controls the switched current.

Timing

RC sets a nominal charge-pulse duration.

Output

FOUT supplies countable open-collector pulses.

Component view