LM331N+ National Semiconductor, LM331N+ Datasheet

LM331N+

Manufacturer Part Number

LM331N+

Description

Manufacturer

National Semiconductor

Datasheet

1.LM331N.pdf (15 pages)

Specifications of LM331N+

Notes

NEW

Date_code

10+

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LM231A/LM231/LM331A/LM331

Precision Voltage-to-Frequency Converters

General Description

The LM231/LM331 family of voltage-to-frequency converters

are ideally suited for use in simple low-cost circuits for

analog-to-digital conversion, precision frequency-to-voltage

conversion, long-term integration, linear frequency modula-

tion 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 advantages of

the voltage-to-frequency conversion techniques, and is easy

to apply in all standard voltage-to-frequency converter appli-

cations. Further, the LM231A/LM331A attain a new high

level of accuracy versus temperature which could only be

attained with expensive voltage-to-frequency modules. Ad-

ditionally the LM231/331 are ideally suited for use in digital

systems at low power supply voltages and can provide low-

cost

controlled systems. And, the frequency from a battery pow-

ered voltage-to-frequency converter can be easily channeled

through a simple photo isolator to provide isolation against

high common mode levels.

The LM231/LM331 utilize a new temperature-compensated

band-gap reference circuit, to provide excellent accuracy

Connection Diagram

Ordering Information

Teflon

is a registered trademark of DuPont

analog-to-digital

conversion

LM231N

LM231AN

LM331N

LM331AN

Device

Order Number LM231AN, LM231N, LM331AN,

DS005680

microprocessor-

See NS Package Number N08E

Temperature Range

−25˚C ≤ T

0˚C ≤ T

Dual-In-Line Package

or LM331N

≤ +70˚C

≤ +85˚C

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

are capable of driving 3 TTL loads, or a high voltage output

up to 40V, yet is short-circuit-proof against V

Features

n Guaranteed linearity 0.01% max

n Improved performance in existing voltage-to-frequency

n Split or single supply operation

n Operates on single 5V supply

n Pulse output compatible with all logic forms

n Excellent temperature stability:

n Low power consumption: 15 mW typical at 5V

n Wide dynamic range, 100 dB min at 10 kHz full scale

n Wide range of full scale frequency: 1 Hz to 100 kHz

n Low cost

conversion applications

frequency

00568021

N08E (DIP)

Package

50 ppm/˚C max

www.national.com

April 2006

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