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參數(shù)資料
| 型號： | AR8618ARU |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:8; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:24; Circular Contact Gender:Socket; Circular Shell Style:Cable Receptacle; Insert Arrangement:24-6 RoHS Compliant: No |
| 中文描述： | 精密20兆赫的CMOS軌到軌輸入/輸出運(yùn)算放大器 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大小： | 495K |
| 代理商： | AR8618ARU |
AD8616/AD8618
These thermal resistance curves were determined using the
AD8616 thermal resistance data for each package and a
maximum junction temperature of 150°C. The following
formula can be used to calculate the internal junction
temperature of the AD8616/AD8618 for any application:
Rev. A | Page 15 of 16
T
J
=
P
DISS
×
θ
JA
+
T
A
where:
T
J
= junction temperature;
P
DISS
= power dissipation;
θ
JA
= package thermal resistance, junction-to-case; and
T
A
= ambient temperature of the circuit.
To calculate the power dissipated by the AD8616/AD8618, use
the following equation:
P
DISS
=
I
LOAD
× (
V
S
–
V
OUT
)
where:
I
LOAD
= output load current;
V
S
= supply voltage; and
V
OUT
= output voltage.
The quantity within the parentheses is the maximum voltage
developed across either output transistor.
POWER CALCULATIONS FOR VARYING OR
UNKNOWN LOADS
Often, calculating power dissipated by an integrated circuit to
determine if the device is being operated in a safe range is not
as simple as it might seem. In many cases, power cannot be
directly measured. This may be the result of irregular output
waveforms or varying loads; indirect methods of measuring
power are required.
There are two methods to calculate power dissipated by an
integrated circuit. The first can be done by measuring the
package temperature and the board temperature. The other is to
directly measure the circuit’s supply current.
Calculating Power by Measuring Ambient and Case
Temperature
Given the two equations for calculating junction temperature:
T
J
=
T
A
+
P θ
JA
where:
T
J
= junction temperature;
T
A
= ambient temperature.
θ
JA
= the junction-to-ambient thermal resistance.
T
J
=
T
C
+
P θ
JC
where
T
C
is case temperature and
θ
JA
and
θ
JC
are given in the
data sheet.
The two equations can be solved for
P
(power):
T
A
+
P θ
JA
=
T
C
+
P θ
JC
P
= (
T
A
–
T
C
)/(
θ
JC
– θ
JA
)
Once power has been determined, it is necessary to go back and
calculate the junction temperature to assure that it has not been
exceeded.
The temperature measurements should be directly on the
package and on a spot on the board that is near the package but
not touching it. Measuring the package could be difficult. A very
small bimetallic junction glued to the package could be used; an
infrared sensing device could be used if the spot size is small
enough.
Calculating Power by Measuring Supply Current
Power can be calculated directly if the supply voltage and
current are known. However, supply current may have a dc
component with a pulse into a capacitive load. This could make
rms current very difficult to calculate. This can be overcome by
lifting the supply pin and inserting an rms current meter into
the circuit. For this to work, the user must be sure that all of the
current is being delivered by the supply pin being measured.
This is usually a good method in a single-supply system;
however, if the system uses dual supplies, both supplies may
need to be monitored.
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