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參數資料
| 型號： | AD8616 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | Precision 20 MHz CMOS Rail-to-Rail Input/Output Operational Amplifiers |
| 中文描述： | 精密20兆赫的CMOS軌到軌輸入/輸出運算放大器 |
| 文件頁數： | 15/16頁 |
| 文件大小： | 495K |
| 代理商： | AD8616 |
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.
相關PDF資料 |
PDF描述 |
|---|---|
| AD8616AR | Precision 20 MHz CMOS Rail-to-Rail Input/Output Operational Amplifiers |
| AD8616ARM | Precision 20 MHz CMOS Rail-to-Rail Input/Output Operational Amplifiers |
| AD8620BR-REEL | Precision, Very Low Noise, Low Input Bias Current, Wide Bandwidth JFET Operational Amplifier |
| AD8620BR-REEL7 | Toggle Switch; Circuitry:SPDT; Switch Operation:On-Off-On; Contact Current Max:6A; Actuator Style:Bat; Switch Terminals:Through Hole; Current Rating:3A; Leaded Process Compatible:Yes; Mounting Type:PCB; Features:Short Actuator RoHS Compliant: Yes |
| AD8620BR | Precision, Very Low Noise, Low Input Bias Current, Wide Bandwidth JFET Operational Amplifier |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8616AR | 功能描述:IC OPAMP GP R-R CMOS 24MHZ 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:DigiTrim® 標準包裝:100 系列:- 放大器類型:通用 電路數:1 輸出類型:- 轉換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SO 包裝:管件 |
| AD8616ARM | 制造商:Analog Devices 功能描述:OP AMP DUAL GP R-R I/O 5V 8MSOP - Bulk |
| AD8616ARM-R2 | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R I/O 5V 8-Pin MSOP T/R 制造商:Rochester Electronics LLC 功能描述:DUAL, PRECISION CMOS RAIL-RAIL OP AMP - Bulk 制造商:Analog Devices 功能描述:IC OP-AMP DUAL R/R |
| AD8616ARM-REEL | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R I/O 5V 8-Pin MSOP T/R |
| AD8616ARMZ | 功能描述:IC OPAMP GP R-R CMOS 24MHZ 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:DigiTrim® 標準包裝:1 系列:- 放大器類型:通用 電路數:4 輸出類型:滿擺幅 轉換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
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