參數(shù)資料
型號: ADSP-21261
廠商: Analog Devices, Inc.
英文描述: SHARC Embedded Processor
中文描述: SHARC處理器嵌入式處理器
文件頁數(shù): 38/44頁
文件大?。?/td> 396K
代理商: ADSP-21261
Rev. 0
|
Page 38 of 44
|
March 2006
ADSP-21261
ENVIRONMENTAL CONDITIONS
The ADSP-21261 processor is rated for performance over the
commercial temperature range, T
AMB
= 0°C to 70°C.
THERMAL CHARACTERISTICS
Table 32
and
Table 33
airflow measurements comply with
JEDEC standards JESD51-2 and JESD51-6 and the junction-to-
board measurement complies with JESD51-8. The junction-to-
case measurement complies with MIL-STD-883. All measure-
ments use a 2S2P JEDEC test board.
To determine the junction temperature of the device while on
the application PCB, use:
where:
T
J
= junction temperature (°C)
T
CASE
= case temperature (°C) measured at the top center of the
package
Ψ
JT
= junction-to-top (of package) characterization parameter =
typical value from the tables below
P
D
= power dissipation. See EE Note No. EE-216
Values of
θ
JA
are provided for package comparison and PCB
design considerations.
θ
JA
can be used for a first-order approxi-
mation of T
J
by the equation:
where:
T
A
= ambient temperature (°C)
Values of
θ
JC
are provided for package comparison and PCB
design considerations when an external heat sink is required.
Figure 33. Typical Output Delay or Hold vs. Load Capacitance
(at Ambient Temperature)
LOAD CAPACITANCE (pF)
7
0
120
20
40
60
80
100
5
6
4
O
3
4
y = 0.0904x - 2.712
2
0
1
1
2
3
T
J
T
CASE
Ψ
J
T
PD
×
(
)
+
=
T
J
T
A
θ
JA
PD
×
(
)
+
=
Table 32. Thermal Characteristics for 136-Ball BGA
1
1
The thermal characteristics values provided in this table are modeled values.
Parameter
θ
JA
θ
JMA
θ
JMA
θ
JC
Ψ
JT
Ψ
JMT
Ψ
JMT
Condition
Airflow = 0 m/s
Airflow = 1 m/s
Airflow = 2 m/s
Typical
31.0
27.3
26.0
6.99
0.16
0.30
0.35
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
Airflow = 0 m/s
Airflow = 1 m/s
Airflow = 2 m/s
Table 33. Thermal Characteristics for 144-Lead LQFP
1
1
The thermal characteristics values provided in this table are modeled values.
Parameter
θ
JA
θ
JMA
θ
JMA
θ
JC
Ψ
JT
Ψ
JMT
Ψ
JMT
Condition
Airflow = 0 m/s
Airflow = 1 m/s
Airflow = 2 m/s
Typical
32.5
28.9
27.8
7.8
0.5
0.8
1.0
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
Airflow = 0 m/s
Airflow = 1 m/s
Airflow = 2 m/s
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ADSP-21262 制造商:AD 制造商全稱:Analog Devices 功能描述:SHARC Processor
ADSP-21262_05 制造商:AD 制造商全稱:Analog Devices 功能描述:Embedded Processor