ADR291/ADR292

Rev. F | Page 12 of 20

TERMINOLOGY

Line Regulation

Line regulation refers to the change in output voltage due to a

specified change in input voltage. It includes the effects of self-

heating. Line regulation is expressed as percent-per-volt, parts-

per-million-per-volt, or microvolts-per-volt change in input

voltage.

Load Regulation

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

load current and includes the effects of self-heating. Load

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

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

Long-Term Stability

Long-term stability refers to the typical shift of output voltage at

25°C on a sample of parts subjected to a test of 1000 hours at

125°C.

( )

( )

[]

()

()

()

6

10

ppm

×

−

=

Δ

−

=

Δ

0

OUT

1

OUT

0

OUT

OUT

1

OUT

0

OUT

OUT

t

V

t

V

t

V

V

t

V

t

V

V

where:

Temperature Coefficient

Temperature coefficient is the change of output voltage over

the operating temperature change, normalized by the output

voltage at 25°C, expressed in ppm/°C. The equation follows:

[]

( )( )

()

()

6

10

C

25

C

ppm/

×

−

×

°

−

=

°

1

2

O

1

O

2

O

O

T

T

V

T

V

T

V

TCV

where:

NC = no connect.

There are internal connections at NC pins that are reserved for

manufacturing purposes. Users should not connect anything at

the NC pins.

Thermal Hysteresis

Thermal hysteresis is defined as the change of output voltage

after the device is cycled through temperatures from +25°C to

−40°C, then to +85°C, and back to +25°C. This is a typical value

from a sample of parts put through such a cycle.

6

10

C)

25

(

)

25

(

[ppm]

C)

25

(

×

°

−

°

=

−

°

=

−

−

OUT

OUT_TC

OUT

HYS

ΟUT

OUT_TC

OUT

HYS

OUT

V

V

C

V

V

V

V

V

where:

−40°C, then to +85°C, and back to +25°C.