ADR391A(RevH) View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADR391A
(Rev.:RevH)

Micropower, Low Noise Precision Voltage References with Shutdown

Analog Devices 

TERMINOLOGY

Temperature Coefficient

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 by

TCV O

[ppm/°C

]

=

VO

VO (T2 )

(25°C)

–

×

VO (T1 )

(T2 –T1

)

× 10 6

(1)

where:

VO (25°C) is VO at 25°C.

VO (T1) is VO at Temperature 1.

VO (T2) is VO at Temperature 2.

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.

ADR391/ADR392/ADR395

Long-Term Stability

Typical shift of output voltage at 25°C on a sample of parts

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

ΔVO = VO(t0) − VO(t1)

ΔVO[ppm]

=

⎜⎜⎝⎛

VO

(t0 ) − VO

VO (t0 )

(t1)

×106

⎟⎟⎠⎞

(2)

where:

VO (t0) is VO at 25°C at Time 0.

VO (t1) is VO at 25°C after 1000 hours operation at 25°C.

Thermally Induced Output Voltage Hysteresis

The change of output voltage after the device cycles through

the temperatures 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.

VO_HYS = VO(25°C) − VO_TC

(3)

VO _ HYS[ppm] =

VO (25o C) − VO _TC

VO (25o C)

× 10 6

(4)

where:

VO (25°C) is VO at 25°C.

VO_TC is VO at 25°C after a temperature cycle from +25°C to

−40°C to +125°C and back to +25°C.

Rev. H | Page 13 of 20

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