adsp-21266skstz-2b Analog Devices, Inc., adsp-21266skstz-2b Datasheet - Page 40

• Manufacturer Part Number: adsp-21266skstz-2b
• Description: Sharc Embedded Processor
• Manufacturer: Analog Devices, Inc.

ADSP-21261/ADSP-21262/ADSP-21266
ENVIRONMENTAL CONDITIONS
The ADSP-2126x processor is rated for performance under T
environmental conditions specified in the
tions on Page
THERMAL CHARACTERISTICS
Table 38
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
T
package
Ψ
is the typical value from
moving air).
P
ADSP-21262 SHARC DSPs (EE-216) for more information.
D
J
CASE
JT
= junction temperature (
= power dissipation. See Estimating Power Dissipation for
T
= junction-to-top (of package) characterization parameter
J
= case temperature (
Figure 33. Typical Output Delay or Hold vs. Load Capacitance
10
–2
–4
= T
8
6
4
2
0
and
0
CASE
Table 39
16.
y = 0.0488x – 1.5923
+ (
Ψ
(at Ambient Temperature)
50
airflow measurements comply with
JT
Table 38
× P
°
°
C) measured at the top center of the
LOAD CAPACITANCE (pF)
C)
D
)
and
100
Table 39
Operating Condi­
150
(Ψ
JMT
Rev. E | Page 40 of 48 | July 2008
indicates
200
AMB
Values of θ
design considerations (θ
used for a first order approximation of T
where:
T
Values of θ
design considerations when an external heat sink is required.
Table 38. Thermal Characteristics for 136-Ball BGA
Table 39. Thermal Characteristics for 144-Lead LQFP
Parameter
θ
θ
θ
θ
Ψ
Ψ
Ψ
Parameter
θ
θ
θ
θ
Ψ
Ψ
Ψ
A
JA
JMA
JMA
JC
JA
JMA
JMA
JC
JT
JMT
JMT
JT
JMT
JMT
T
= ambient temperature °C
J
=
T
A
JA
JC
+ (
are provided for package comparison and PCB
are provided for package comparison and PCB
θ
Condition
Airflow = 0 m/s
Airflow = 1 m/s
Airflow = 2 m/s
Airflow = 0 m/s
Airflow = 1 m/s
Airflow = 2 m/s
Condition
Airflow = 0 m/s
Airflow = 1 m/s
Airflow = 2 m/s
Airflow = 0 m/s
Airflow = 1 m/s
Airflow = 2 m/s
JA
×
P
D
JMA
)
indicates moving air). θ
J
by the equation
Typical
31.0
27.3
26.0
6.99
0.16
0.30
0.35
Typical
32.5
28.9
27.8
7.8
0.5
0.8
1.0
JA
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
can be