1

LM185-2.5/

LM285-2.5/LM385-2.5

APPLICATIO S

DESCRIPTIO

FEATURES

TYPICAL APPLICATIO

Micropower Voltage

Reference

s

Portable Meter References

s

Portable Test Instruments

s

Battery-Operated Systems

s

Panel Meters

s

Current Loop Instrumentation

s

20

µA to 20mA Operating Range

s

Guaranteed 1% Initial Voltage Tolerance

s

Guaranteed 1

Ω Dynamic Impedance

s

Very Low Power Consumption

The LM185-2.5 is a two-terminal band gap reference

diode that has been designed for applications which

require precision performance with micropower opera-

tion. The device provides guaranteed operation specifica-

tions at currents as low as 20

µA. The nominal voltage is

2.5V with both 1% and 2% tolerances available. Some

additional features are: maximum dynamic impedance of

1

Ω, low noise and excellent stability over time and tem-

perature. The advanced design, processing and testing

techniques make Linear’s LM185-2.5 a superior choice

over previous designs. A circuit for cold junction compen-

sation of a thermocouple is shown below.

For applications requiring guaranteed temperature drift,

see the LT1034 data sheet.

REVERSE CURRENT (mA)

0

4

8

12

16

0.01

1

10

100

LM185-2.5 TA02

–4

0.1

–55

Reverse Voltage Change

Thermocouple Cold Junction Compensator

2k

450

Ω

10k ADJUST

FOR 12.17mV

AT 25

°C

ACROSS 450

Ω

16k

950

Ω

LM385-2.5

100k W.W.

ZERO

1M

2 MERCURY

CELLS 2.6V

METER

+

–

TYPE K

LM185-2.5 TA01

LM334

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