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參數資料
| 型號： | ADR390 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
| 中文描述： | 精密低漂移2.048 V/2.5 V/4.096第V / 5.0V的SOT - 23封裝，帶有關斷參考 |
| 文件頁數： | 16/20頁 |
| 文件大小： | 269K |
| 代理商： | ADR390 |
ADR390/ADR391/ADR392/ADR395
THEORY OF OPERATION
Band gap references are the high performance solution for low
supply voltage and low power voltage reference applications,
and the ADR390/ADR391/ADR392/ADR395 are no exception.
The uniqueness of these devices lies in the architecture. As
shown in Figure 40, the ideal zero TC band gap voltage is
referenced to the output, not to ground. Therefore, if noise
exists on the ground line, it is greatly attenuated on V
OUT
. The
band gap cell consists of the PNP pair, Q51 and Q52, running at
unequal current densities. The difference in V
BE
results in a
voltage with a positive TC, which is amplified by a ratio of
Rev. F | Page 16 of 20
R54
R58
2
×
This PTAT voltage, combined with V
BE
s of Q51 and Q52,
produces a stable band gap voltage.
Reduction in the band gap curvature is performed by the ratio
of the resistors R44 and R59, one of which is linearly
temperature dependent. Precision laser trimming and other
patented circuit techniques are used to further enhance the
drift performance.
SHDN
R60
Q51
R54
R61
R53
Q52
R58
R59
R44
R48
R49
Q1
V
IN
V
OUT (FORCE)
V
OUT (SENSE)
GND
0
Figure 40. Simplified Schematic
DEVICE POWER DISSIPATION CONSIDERATIONS
The ADR390/ADR391/ADR392/ADR395 are capable of deli-
vering load currents to 5 mA, with an input voltage that ranges
from 2.8 V (ADR391 only) to 15 V. When these devices are
used in applications with large input voltages, care should be
taken to avoid exceeding the specified maximum power
dissipation or junction temperature because it could result in
premature device failure. The following formula should be used
to calcu-late a device’s maximum junction temperature or
dissipation:
JA
A
J
D
T
–
T
P
θ
=
In this equation, T
J
and T
A
are, respectively, the junction and
ambient temperatures. P
D
is the device power dissipation, and
θ
JA
is the device package thermal resistance.
SHUTDOWN MODE OPERATION
The ADR390/ADR391/ADR392/ADR395 include a shutdown
feature that is TTL/CMOS level compatible. A logic low or a
zero volt condition on the SHDN pin is required to turn the
devices off. During shutdown, the output of the reference
becomes a high impedance state, where its potential would then
be determined by external circuitry. If the shutdown feature is
not used, the SHDN pin should be connected to V
IN
(Pin 2).
相關PDF資料 |
PDF描述 |
|---|---|
| ADR390ART-RL | Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
| ADR390ART-RL7 | Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
| ADR391 | Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
| ADR392 | Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
| ADR392ART-RL | Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
相關代理商/技術參數 |
參數描述 |
|---|---|
| adr390art-r2 | 制造商:Analog Devices 功能描述:V-REF PRECISION 2.048V 5MA 5PIN SOT-23 - Tape and Reel 制造商:Rochester Electronics LLC 功能描述: |
| ADR390ART-REEL | 制造商:Analog Devices 功能描述:V-REF PRECISION 2.048V 5MA 5PIN SOT-23 - Tape and Reel |
| ADR390ART-REEL7 | 制造商:Analog Devices 功能描述:V-REF PRECISION 2.048V 5MA 5PIN SOT-23 - Tape and Reel |
| ADR390ART-RL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
| ADR390ART-RL7 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision Low Drift 2.048 V/2.5 V/4.096 V/ 5.0 V SOT-23 Reference with Shutdown |
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