ADR391/ADR392/ADR395

Rev. H | Page 13 of 20

TERMINOLOGY

Temperature Coefficient

The change of output voltage with respect to operating temperature

changes normalized by the output voltage at 25°C. This parameter

is expressed in ppm/°C and can be determined by

[]

()

( )

()

()

6

10

–

C

25

–

C

ppm/

×

×

°

=

°

1

2

O

1

O

2

O

O

T

T

V

T

V

T

V

TCV

(1)

where:

Line Regulation

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

voltage. This parameter accounts for 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. This parameter accounts for 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 a test of 1000 hours at 25°C.

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

×

−

=

Δ

6

10

)

(

)

(

)

(

]

ppm

[

0

O

1

O

0

O

O

t

V

t

V

t

V

V

(2)

where:

Thermally Induced Output Voltage Hysteresis

The change of output voltage after the device cycles through

the temperatures from +25°C to –40°C to +125°C and back to

+25°C. This is a typical value from a sample of parts put through

such a cycle.

(3)

6

_

_

10

)

25

(

)

25

(

]

ppm

[

×

−

=

C

V

V

C

V

V

O

TC

O

O

HYS

O

o

o

(4)

where:

−40°C to +125°C and back to +25°C.