ADR380/ADR381

Rev. C | Page 10 of 16

TERMINOLOGY

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:

6

10

)

(

)

(

)

(

]

C

ppm/

[

×

−

×

°

−

=

°

1

2

OUT

1

OUT

2

OUT

OUT

T

T

C)

(25

V

T

V

T

V

TCV

where:

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

A typical shift in output voltage over 1000 hours at a controlled

temperature. Figure 24 and Figure 25 show a sample of parts

measured at different intervals in a controlled environment of

50°C for 1000 hours.

6

10

)

(

)

(

)

(

]

ppm

[

)

(

)

(

×

−

=

Δ

−

=

Δ

0

UT

O

1

OUT

0

OUT

UT

O

1

UT

O

0

OUT

OUT

t

V

t

V

t

V

V

t

V

t

V

V

where:

temperature.

Note that 50°C was chosen because most applications run at a

higher temperature than 25°C.

Thermal Hysteresis

The change of output voltage after 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.

6

_

_

_

_

10

)

C

25

(

]

ppm

[

×

°

−

°

=

−

°

=

C)

(25

V

V

V

V

V

C)

(25

V

V

OUT

TC

OUT

OUT

HYS

OUT

TC

OUT

UT

O

HYS

OUT

where:

−40°C to +85°C and back to +25°C.