ADR01/ADR02/ADR03/ADR06

Rev. F | Page 9 of 20

PARAMETER DEFINITIONS

Temperature Coefficient

The change of output voltage with respect to operating tem-

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

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

following equation:

6

10

)

25

(

)

(

)

(

]

/

[

×

−

×

°

−

=

°

1

2

O

1

O

2

O

O

T

T

C

V

T

V

T

V

C

ppm

TCV

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 1,000 hours at 25°C:

)

(

)

(

1

O

0

O

O

t

V

t

V

V

−

=

∆

6

10

)

(

)

(

)

(

]

[

×

−

=

∆

0

O

1

O

0

O

O

t

V

t

V

t

V

ppm

V

where:

The majority of the shift is seen in the first 200 hours, and,

as time goes by, the drift decreases significantly. So for the

subsequent 1,000 hours’ time points, this drift is much smaller

than the first.

Thermal Hysteresis

Defined as the change of output voltage after the device is

cycled through temperature 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.

TC

O

O

HYS

O

V

C

V

V

_

_

)

25

(

−

°

=

6

_

_

10

)

25

(

)

25

(

]

[

×

°

−

°

=

C

V

V

C

V

ppm

V

O

TC

O

O

HYS

O

where:

+125°C and back to +25°C

NOTES

Input Capacitor

Input capacitors are not required on the ADR01/ADR02/

ADR03/ADR06. There is no limit for the value of the capacitor

used on the input, but a 1 µF to 10 µF capacitor on the input

improves transient response in applications where the supply

suddenly changes. An additional 0.1 µF in parallel also helps to

reduce noise from the supply.

Output Capacitor

The ADR01/ADR02/ADR03/ADR06 do not require output

capacitors for stability under any load condition. An output

capacitor, typically 0.1 µF, filters out any low level noise voltage

and does not affect the operation of the part. On the other hand,

the load transient response can be improved with an additional

1 µF to 10 µF output capacitor in parallel. A capacitor here acts

as a source of stored energy for a sudden increase in load

current. The only parameter that degrades by adding an output

capacitor is the turn-on time, and it depends on the size of the

capacitor chosen.