Datasheet

Rev. D | Page 79 of 88 | July 2013
ADSP-BF522/ADSP-BF523/ADSP-BF524/ADSP-BF525/ADSP-BF526/ADSP-BF527
ENVIRONMENTAL CONDITIONS
To determine the junction temperature on the application
printed circuit board use:
where:
T
J
= Junction temperature (°C)
T
CASE
= Case temperature (°C) measured by customer at top
center of package.

JT
= From Table 66
P
D
= Power dissipation — For a description, see Total Power
Dissipation on Page 35.
Values of 
JA
are provided for package comparison and printed
circuit board design considerations. 
JA
can be used for a first
order approximation of T
J
by the equation:
where:
T
A
= Ambient temperature (°C)
Values of 
JC
are provided for package comparison and printed
circuit board design considerations when an external heat sink
is required.
Values of 
JB
are provided for package comparison and printed
circuit board design considerations.
In Table 66, 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.
Figure 74. Driver Type G Typical Rise and Fall Times (10%–90%) vs.
Load Capacitance (2.5V V
DDEXT
/V
DDMEM
)
Figure 75. Driver Type G Typical Rise and Fall Times (10%–90%) vs.
Load Capacitance (3.3V V
DDEXT
/V
DDMEM
)
4
RISE AND FALL TIME (10% TO 90%)
LOAD CAPACITANCE (pF)
0 50 100 150
6
0
1
2
5
200
t
RISE
t
FALL
3
7
t
RISE
= 2.5V @ 25 ° C
t
FALL
= 2.5V @ 25 ° C
8
9
3
RISE AND FALL TIME (10% TO 90%)
LOAD CAPACITANCE (pF)
0 50 100 150
9
5
0
1
2
4
200
t
RISE
t
FALL
t
RISE
= 3.3V @ 25 ° C
t
FALL
= 3.3V @ 25 ° C
6
8
7
T
J
T
CASE

JT
P
D
+=
Table 65. Thermal Characteristics for BC-208-1 Package
Parameter Condition Typical Unit

JA
0 linear m/s air flow 23.20 °C/W

JMA
1 linear m/s air flow 20.20 °C/W

JMA
2 linear m/s air flow 19.20 °C/W

JB
13.05 °C/W

JC
6.92 °C/W

JT
0 linear m/s air flow 0.18 °C/W

JT
1 linear m/s air flow 0.27 °C/W

JT
2 linear m/s air flow 0.32 °C/W
Table 66. Thermal Characteristics for BC-289-2 Package
Parameter Condition Typical Unit

JA
0 linear m/s air flow 34.5 °C/W

JMA
1 linear m/s air flow 31.1 °C/W

JMA
2 linear m/s air flow 29.8 °C/W

JB
20.3 °C/W

JC
8.8 °C/W

JT
0 linear m/s air flow 0.24 °C/W

JT
1 linear m/s air flow 0.44 °C/W

JT
2 linear m/s air flow 0.53 °C/W
T
J
T
A

JA
P
D
+=