ADSP-BF516BSWZ-4 Datasheet, PDF (56/68 Pages) Analog Devices – Blackfin Embedded Processor

ADSP-BF512/BF512F, BF514/BF514F, BF516/BF516F, BF518/BF518F
THERMAL CHARACTERISTICS
To determine the junction temperature on the application
printed circuit board use:
T_J = T_CASE + (Ψ_JT × P_D)
where:
T_J = Junction temperature (°C)
T_CASE = Case temperature (°C) measured by customer at top
center of package.
Ψ_JT = From Table 51
P_D = Power dissipation (see Total Power Dissipation on Page 23
for the method to calculate P_D)
Values of θ_JA are provided for package comparison and printed
circuit board design considerations. θ_JA can be used for a first
order approximation of T_J by the equation:
T_J = T_A + (θ_JA × P_D)
where:
T_A = Ambient temperature (°C)
Values of θ_JC are provided for package comparison and printed
circuit board design considerations when an external heat sink
is required.
Values of θ_JB are provided for package comparison and printed
circuit board design considerations.
In Table 51, airflow measurements comply with JEDEC stan-
dards 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 (Method 1012.1).
All measurements use a 2S2P JEDEC test board.
The LQFP_EP package requires thermal trace squares and ther-
mal vias to an embedded ground plane in the PCB. The paddle
must be connected to ground for proper operation to data sheet
specifications. Refer to JEDEC standard JESD51-5 for more
information.
Table 50. Thermal Characteristics for SQ-176-2 Package
Parameter
θ_JA
θ_JMA
θ_JMA
θ_JC
Ψ_JT
Ψ_JT
Ψ_JT
Condition
0 Linear m/s Airflow
1 Linear m/s Airflow
2 Linear m/s Airflow
Not Applicable
0 Linear m/s Airflow
1 Linear m/s Airflow
2 Linear m/s Airflow
Typical
17.4
14.8
14.0
7.8
0.28
0.39
0.48
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
Table 51. Thermal Characteristics for BC-168-1 Package
Parameter
θ_JA
θ_JMA
θ_JMA
θ_JC
Ψ_JT
Ψ_JT
Ψ_JT
Condition
0 Linear m/s Airflow
1 Linear m/s Airflow
2 Linear m/s Airflow
Not Applicable
0 Linear m/s Airflow
1 Linear m/s Airflow
2 Linear m/s Airflow
Typical
30.5
27.6
26.3
11.1
0.20
0.35
0.45
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
Rev. B | Page 56 of 68 | January 2011