REV. B

ADR290/ADR291/ADR292

–6–

PARAMETER DEFINITION

Line Regulation

The change in output voltage due to a specified change in input

voltage. It includes the effects of self-heating. Line regulation is

expressed in either percent-per-volt, parts-per-million-per-

volt, or microvolts-per-volt change in input voltage.

Load Regulation

The change in output voltage due to a specified change in load

current. It includes the effects of self-heating. Load regulation

is expressed in either microvolts-per-milliampere, parts-per-

million-per-milliampere, or ohms of dc output resistance.

Long-Term Stability

Typical shift of output voltage at 25

°C on a sample of parts

subjected to high-temperature operating life test of 1000

hours at 125

°C.

∆

∆

VV

t

V

t

V

ppm

Vt

Vt

Vt

OO

O

OO

O

=

×

() –

()

=

() –

()

()

0O

1

01

0

[]

10

6

Where

°C at time 0

°C after 1000 hours operation at 125°C

Temperature Coefficient

The change of output voltage over the operating temperature

change and normalized by the output voltage at 25

°C, expressed

in ppm/

°C. The equation follows:

TCV

ppm C

VT

VT

VC

T

T

O

OO

O

[/

]

() –

()

() (

–

)

°=

°×

×

21

21

6

25

10

Where

NC = No Connect

(There are in fact internal connections at NC pins which are

reserved for manufacturing purposes. Users should not connect

anything at NC pins.)

Thermal Hysteresis

Thermal hysteresis is defined as the change of output voltage af-

ter the device is cycled through temperature from +25

°C to

–40

°C to +85°C and back to +25°C. This is a typical value from

a sample of parts put through such a cycle.

VV

C

V

V

ppm

VC

V

VC

O HYS

O

O TC

O HYS

OO TC

O

–

_

–

_

() –

[]

() –

()

=°

=

°

°

×

25

25

25

10

6

Where

°C after temperature cycle at +25°C to

–40

°C to +85°C and back to +25°C