TLH5263

February 1995

LM1819 Air-Core Meter Driver

General Description

The LM1819 is a function generatordriver for air-core

(moving-magnet) meter movements A Norton amplifier and

an NPN transistor are included on chip for signal condition-

ing as required Driver outputs are self-centering and devel-

anteed over a full 305-degree operating range

Features

Y

Self-centering 20 mA outputs

Y

12V operation

Y

Norton amplifier

Y

Function generator

Applications

Y

Air-core meter driver

Y

Tachometers

Y

Ruggedized instruments

Typical Application

TLH5263 – 1

FIGURE 1 Automotive Tachometer Application Circuit shown operates

with 4 cylinder engine and deflects meter pointer (270 ) at 6000 RPM

Order Number LM1819M or LM1819N

See NS Package Number M14A or N14A

TRW Type X463UW Polycarbonate Capacitor

Components Required for Automotive Load Dump Protection

Available from FARIA Co

P O Box 983 Uncasville CT 06382

Tel 203-848-9271

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A