LINEAR TECHNOLOGY LT1004 User's Guide

LT1004

Micropower Voltage

Reference

FEATURES DESCRIPTIO Guaranteed ±4m V Initial Accuracy LT1004-1.2 The LT®1004 micropower voltage reference is a Guaranteed ±20m V Accuracy LT1004-2.5 2-terminal bandgap reference diode designed to provide Guaranteed 10µA Operating Current high accuracy and excellent temperature characteristics at Guaranteed Temperature Performance very low operating currents. Optimization of the key

Operates up to 20m A parameters in the design, processing and testing of the Very Low Dynamic Impedance device results in accuracy specifications previously attain- able only with selected units. Below is a distribution plot of reference voltage for a typical lot of LT1004-1.2. Virtually

APPLICATIO S

all of the units fall well within the prescribed limits of

Portable Meter References ±4m V. Portable Test Instruments

The LT1004 is a pin-for-pin replacement for the

Battery-Operated Systems

LM185/LM385 series of references with improved accu-

Current Loop Instrumentation

racy specifications. More important, the LT1004 is an

NU BE OF AR TS attractive device for use in systems where accuracy was

previously obtained at the expense of power consump-

tion and trimming.

1. For a low drift micropower reference with guaranteed 1.

temperature coefficient, see the LT1034 data sheet.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO 1. 1.

Typical Distribution of

Reference Voltage (LT1004-1.2)Micropower Cold Junction Compensation for Thermocouples

1200 PARTS

100k TA = 25°C

3V LITHIUM

1684Ω 5k AT 25°C†

LT1004-1.2

THERMOCOUPLE *QUIESCENT CURRENT ≅ 15µA

TYPE R1 YELLOW SPRINGS INST. CO. 233k PART #44007

COMPENSATES WITHIN

±1°C FROM 0°C TO 60°C 1004 TA02

2.1M 1004 TA01