ADR530 Analog Devices, ADR530 Datasheet

ADR530

Manufacturer Part Number

ADR530

Description

Manufacturer

Analog Devices

Datasheet

1.ADR512.pdf (2 pages)

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One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106 • Tel: 781/329-4700 • Fax: 781/326-8703 •

Long-Term Drift (LTD) in voltage references is a param-

eter that can be confusing and misleading. It is given as

a typical parameter in data sheets, but can cause sig-

nificant accuracy limitations in system. Unlike tempco

and initial accuracy, where a one-time calibration can be

used to eliminate these errors, attempts to reduce LTD

requires frequent system calibration. This can be both

time consuming and expensive.Therefore, it is important

to understand the significance of LTD.

Most data sheets specify LTD as ppm/1,000 hours.

1,000 hours is equal to 41.5 days, and in one year there

are 8,766 hours.Therefore, if a part is specified to change

by 70 ppm/1,000 hours, does this mean that in one year it

will change by 613 ppm? No, it does not.This is a common

mistake that is made by only reading the data sheet but

not understanding what LTD really is.

The following graph shows a typical LTD curve of a typical

ADI band gap reference. The output voltage of this part

has been recorded every hour for 1,000 hours in a controlled

environment with a temperature of 50C.

REV. 0

Figure 1. Typical Long-Term Drift Over 1,000 Hours

–100

–150

200

150

100

–50

100

200

300

400

The Effect of Long-Term Drift on Voltage References

TIME (Hours)

500

600

700

800

900 1,000

by Colm Brazil

As the graph shows, in the first 200 hours there is a lot of

movement in the part. After this initial movement there

is very little change in the V

Over the next 1,000 hours the variation is normally less

than one quarter of that in the first 1,000 hours. This

trend continues with the change being an approximate

cut in four from the previous time period. The changes

in output take a “drunken walk” pattern: the changes are

random and cannot be predicted, so the output might

change positive in the first time period but negative in

the second.

• 70 ppm/1,000 hours does not mean the part will change

• The changes are random, so if the part starts off in one di-

Ways to Eliminate LTD Effects

• Calibrate the system after 200 hours, thus eliminating

• Burn in the part for a short period of time to eliminate

by 613 over one year but will change more in the area

of 140 ppm/year

rection it does not mean it will continue in that direction

the early changes

APPLICATION NOTE

OUT

for the last 800 hours.

www.analog.com

AN-713

Related parts for ADR530

ADR530 Summary of contents

Page 1

One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106 • Tel: 781/329-4700 • Fax: 781/326-8703 • The Effect of Long-Term Drift on Voltage References Long-Term Drift (LTD) in voltage references is a param- eter that can be confusing ...

Page 2

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