ADR01 Analog Devices, Inc., ADR01 Datasheet - Page 9

• Manufacturer Part Number: ADR01
• Description: Ultracompact Precision10 V/5 V/2.5 V/3.0 V Voltage References
• Manufacturer: Analog Devices, Inc.

TERMINOLOGY
Temperature Coefficient
The change of output voltage with respect to operating tempera-
ture changes normalized by the output voltage at 25°C. This
parameter is expressed in ppm/°C and can be determined by the
following equation:
where:
V
V
V
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 1000 hours at 25°C.
where:
V
V
The majority of the shift is seen in the first 200 hours, and as
time goes by, the drift decreases significantly. This drift is much
smaller for the subsequent 1000 hours of time points than for
the first.
O
O
O
O
O
(25°C) = V
(T
(T
(t
(t
0
1
TCV
1
2
) = V
) = V
Δ
Δ
) = V
) = V
V
V
O
O
[
O
O
O
=
ppm
[
O
O
at 25°C at Time 0.
at 25°C after 100 hours of operation at 25°C.
ppm
V
at Temperature 1.
at Temperature 2.
O
O
at 25°C.
]
(
t
=
/
0
°
C
)
V
−
O
]
V
=
(
t
V
O
0
V
)
O
(
O
t
−
(
1
( )
V
t
T
V
)
0
O
O
)
O
(
(
25
t
−
1
V
°
)
C
×
O
)
10
( )
T
1
6
×
10
6
Rev. J | Page 9 of 24
Thermal Hysteresis
Defined as the change of output voltage after the device is
cycled through 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.
where:
V
V
to +125°C and back to +25°C.
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. Alternatively, 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.
V
O
O_TC
O
(25°C) = V
_
HYS
V
= V
O_HYS
[
ppm
O
at 25°C after temperature cycle at +25°C to −40°C
= V
]
O
=
at 25°C.
O
V
(25°C) − V
O
ADR01/ADR02/ADR03/ADR06
(
25
V
O
°
C
(
25
)
−
°
O_TC
C
V
)
O
_
TC
×
10
6