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AD8273 データシート(PDF) 4 Page - Aavid, Thermal Division of Boyd Corporation

部品番号 AD8273
部品情報  G = 0.2, Level Translation, 16-Bit ADC Driver
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メーカー  AAVID [Aavid, Thermal Division of Boyd Corporation]
ホームページ  https://www.boydcorp.com/aavid.html
Logo AAVID - Aavid, Thermal Division of Boyd Corporation

AD8273 データシート(HTML) 4 Page - Aavid, Thermal Division of Boyd Corporation

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AD8275
Rev. A | Page 4 of 16
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Rating
Supply Voltage
18 V
Output Short-Circuit Current
See derating curve
(Figure 3)
Voltage at +IN, −IN Pins
−VS + 40 V, +VS − 40 V
Voltage at REFx, +VS, − VS, SENSE,
and OUT Pins
−VS − 0.5 V, +VS + 0.5 V
Current into REFx, +IN, −IN, SENSE,
and OUT Pins
3 mA
Storage Temperature Range
−65°C to +130°C
Specified Temperature Range
−40°C to +85°C
Thermal Resistance (θJA)
135°C/W
Package Glass Transition Temperature
(TG)
140°C
ESD Human Body Model
2 kV
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
MAXIMUM POWER DISSIPATION
The maximum safe power dissipation in the AD8275 package is
limited by the associated rise in junction temperature (TJ) on
the die. The plastic encapsulating the die locally reaches the
junction temperature. At approximately 140°C, which is the
glass transition temperature, the plastic changes its properties.
Even temporarily exceeding this temperature limit can change
the stresses that the package exerts on the die, permanently
shifting the parametric performance of the AD8275. Exceeding
a junction temperature of 140°C for an extended period can
result in changes in silicon devices, potentially causing failure.
The still air thermal properties of the package and PCB (θJA),
the ambient temperature (TA), and the total power dissipated in
the package (PD) determine the junction temperature of the die.
The junction temperature is calculated as follows:
TJ = TA + (PD × θJA)
The power dissipated in the package (PD) is the sum of the
quiescent power dissipation and the power dissipated in the
package due to the load drive for all outputs. The quiescent
power is the voltage between the supply pins (VS) times the
quiescent current (IS). Assuming the load (RL) is referenced to
midsupply, the total drive power is VS/2 × IOUT, some of which is
dissipated in the package and some of which is dissipated in the
load (VOUT × IOUT).
The difference between the total drive power and the load
power is the drive power dissipated in the package.
PD = Quiescent Power + (Total Drive Power − Load Power)
(
)
L
OUT
L
OUT
S
S
S
D
R
V
R
V
V
I
V
P
2
2


×
+
×
=
In single-supply operation with RL referenced to –VS, the worst
case is VOUT = VS/2.
Airflow increases heat dissipation, effectively reducing θJA. In
addition, more metal directly in contact with the package leads
from metal traces, through holes, ground, and power planes
reduces θJA.
Figure 3 shows the maximum safe power dissipation in the
package vs. the ambient temperature on a 4-layer JEDEC
standard board.
0
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
–40
0
–20
20
40
60
80
100
120
AMBIENT TEMPERATURE (°C)
Figure 3. Maximum Power Dissipation vs. Ambient Temperature
ESD CAUTION


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