ADR318

Rev. A | Page 8 of 12

TERMINOLOGY

Temperature Coefficient

Temperature coefficient is 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 with the following equation:

()

( )

()

()

6

10

C

25

C

ppm

×

−

×

°

−

=

⎥⎦

⎤

⎢⎣

⎡

°

1

2

O

1

O

2

O

O

T

T

V

T

V

T

V

TCV

(1)

where:

Long-Term Stability

Long-term stability is the typical shift of output voltage at 25°C

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

[]

()

()

()

6

10

ppm

×

−

=

Δ

0

O

1

O

0

O

O

t

V

t

V

t

V

V

(2)

where:

Thermal Hysteresis

Thermal hysteresis is 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.

[]

(

)

()

6

_

_

10

C

25

C

25

ppm

×

°

−

°

=

O

TC

O

O

HYS

O

V

V

V

V

(3)

where:

+125°C and back to +25°C.