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LM231, LM331

SNOSBI2C – JUNE 1999 – REVISED SEPTEMBER 2015

LMx31x Precision Voltage-to-Frequency Converters

1 Features

3 Description

The LMx31 family of voltage-to-frequency converters

1

•

Ensured Linearity 0.01% Maximum

are ideally suited for use in simple low-cost circuits

•

Improved Performance in Existing Voltage-to-

for analog-to-digital conversion, precision frequency-

Frequency Conversion Applications

to-voltage conversion, long-term integration, linear

•

Split or Single-Supply Operation

frequency modulation or demodulation, and many

other functions. The output when used as a voltage-

•

Operates on Single 5-V Supply

to-frequency converter is a pulse train at a frequency

•

Pulse Output Compatible With All Logic Forms

precisely proportional to the applied input voltage.

•

Excellent Temperature Stability: ±50 ppm/°C

Thus, it provides all the inherent advantages of the

Maximum

voltage-to-frequency conversion techniques, and is

easy to apply in all standard voltage-to-frequency

•

Low Power Consumption: 15 mW Typical at 5 V

converter applications.

•

Wide Dynamic Range, 100 dB Minimum at 10-kHz

Full Scale Frequency

Device Information(1)

•

Wide Range of Full Scale Frequency:

PART NUMBER

PACKAGE

BODY SIZE (NOM)

1 Hz to 100 kHz

LM231

PDIP (8)

9.81 mm × 6.35 mm

•

Low-Cost

LM331

(1) For all available packages, see the orderable addendum at

2 Applications

the end of the data sheet.

•

Voltage to Frequency Conversions

•

Frequency to Voltage Conversions

•

Remote-Sensor Monitoring

•

Tachometers

Schematic Diagram

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.