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參數資料
| 型號： | ADR421 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Ultraprecision Low Noise, 2.048 V/2.500 V/ 3.00 V/5.00 V XFET Voltage References |
| 中文描述： | 超精密低噪聲，2.048 V/2.500第V / 3.00 V/5.00 V XFET電壓基準 |
| 文件頁數： | 5/16頁 |
| 文件大小： | 223K |
| 代理商： | ADR421 |
REV. B
ADR420/ADR421/ADR423/ADR425
–5–
PARAMETER DEFINITIONS
Temperature Coefficient
The change of output voltage over the operating temperature
range and normalized by the output voltage at 25
°
C, expressed
in ppm/
°
C. The equation follows:
TCV
ppm C
V
(
T
°
V
T
–
V
C
T
T
O
O
25
O
O
/
(
)
–
) (
(
)
)
(
)
=
×
2
1
2
1
6
10
where
V
O
(25
°
C)
= V
O
at 25
°
C
V
O
(
T
1
) = V
O
at Temperature 1
V
O
(
T
2
) = V
O
at Temperature 2.
Line Regulation
The change in output voltage due to a specified change in input
voltage. It includes 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. It includes 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 operation life test of 1000 hours at 125
°
C:
V
V t
V t
V t
V t
( )
V
ppm
V t
O
O
O
=
=
×
( ) –
( ) –
( )
( )
(
)
1
1
6
10
where
V
O
(
t
0
) = V
O
at 25
°
C at Time 0
V
O
(
t
1
) = V
O
at 25
°
C after 1,000 hours operation at 125
°
C.
Thermal Hysteresis
Thermal hysteresis
is 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.
V
V
V
C
C
(
V
V
C
°
V
ppm
V
O
HYS
O
O TC
_
O
HYS
O
O TC
_
)
O
_
_
(
(
)
–
)
–
25
(
)
=
°
°
=
×
25
25
10
6
where
V
O
(
25
°
C
) = V
O
at 25
°
C
V
O_TC
= V
O
at 25
°
C after temperature cycle at +25
°
C to
–
40
°
C
to +125
°
C and back to +25
°
C.
Input Capacitor
Input capacitors are not required on the ADR42x. There is no
limit for the value of the capacitor used on the input, but a 1
μ
F to
10
μ
F capacitor on the input will improve transient response in
applications where the supply suddenly changes. An additional
0.1
μ
F in parallel will also help to reduce noise from the supply.
Output Capacitor
The ADR42x does not need output capacitors for stability
under any load condition. An output capacitor, typically 0.1
μ
F,
will filter out any low-level noise voltage and will not affect
the operation of the part. On the other hand, the load transient
response can be improved with an additional 1
μ
F to 10
μ
F
output capacitor in parallel. A capacitor here will act as a source
of stored energy for sudden increase in load current. The only
parameter that will degrade, by adding an output capacitor, is
turn-on time and it depends on the size of the capacitor chosen.
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