Data Sheet

ADR01/ADR02/ADR03/ADR06

Rev. R | Page 9 of 20

TERMINOLOGY

Dropout voltage, sometimes referred to as supply voltage head-

room or supply output voltage differential, is defined as the

minimum voltage differential between the input and output

necessary for the device to operate, such as

Because the dropout voltage depends upon the current passing

through the device, it is always specified for a given load current.

The temperature coefficient relates the change in output voltage

to the change in ambient temperature of the device, as normalized

by the output voltage at 25°C. This parameter is expressed in

ppm/°C and can be determined by the following equation:

(

)

[

]

C

ppm/

10

)

25

(

)

(

)

(

6

1

2

1

2





×

−

×

−

=

T

T

C

V

T

V

T

V

TCV

OUT

OUT

OUT

O

where:

Output voltage hysteresis represents the change in output

voltage after the device is exposed to a specified temperature

cycle. This may be expressed as either a shift in voltage or a

difference in parts per million from the nominal output as follows:

]

ppm

[

10

)

25

(

)

25

(

6

_

_

×

−

=

C

V

V

C

V

V

OUT

TC

OUT

OUT

HYS

OUT





where:

Thermal hysteresis occurs as a result of forces exhibited upon

the internal die by its packaging. The effect is more pronounced

in parts with smaller packages.

Long-term stability refers to the shift in output voltage at 25°C

after 1000 hours of operation in a 25°C environment. This may

also be expressed as either a shift in voltage or a difference in

parts per million from the nominal output as follows:

]

ppm

[

10

)

(

)

(

)

(

Δ

6

0

0

1

_

×

−

=

t

V

t

V

t

V

V

OUT

OUT

OUT

LTD

OUT

where,

Line Regulation

Line regulation refers to the change in output voltage in

response to a given change in input voltage, and is expressed in

either percent per volt, parts per million per volt, or microvolt

per volt change in input voltage. This parameter accounts for

the effects of self-heating.

Load Regulation

Load regulation refers to the change in output voltage in

response to a given change in load current, and is expressed

in either microvolts per milliampere, parts per million per

milliampere, or ohms of dc output resistance. This parameter

accounts for the effects of self-heating.