adsp-21371 Analog Devices, Inc., adsp-21371 Datasheet - Page 45

• Manufacturer Part Number: adsp-21371
• Description: Sharc Processor
• Manufacturer: Analog Devices, Inc.

THERMAL CHARACTERISTICS
The ADSP-21371 processor is rated for performance over the
temperature range specified in
Page
Table 42
JESD51-2 and JESD51-6 and the junction-to-board measure-
ment complies with JESD51-8. Test board design complies with
JEDEC standards JESD51-7 (MQFP). The junction-to-case
measurement complies with MIL- STD-883. All measurements
use a 2S2P JEDEC test board.
To determine the junction temperature of the device while on
the application PCB, use:
where:
T
T
package
<
is the Typical value from
P
Values of T
design considerations. T
mation of T
where:
T
Values of T
design considerations when an external heatsink is required.
D
J
CASE
A
JT
= junction temperature qC
= power dissipation
= ambient temperature qC
= junction-to-top (of package) characterization parameter
15.
= case temperature (qC) measured at the top center of the
Figure 39. Typical Output Delay or Hold vs. Load Capacitance
10
-4
-2
8
4
2
0
6
airflow measurements comply with JEDEC standards
0
JA
JC
J
by the equation:
are provided for package comparison and PCB
are provided for package comparison and PCB
Y = 0.0488X - 1.5923
T
J
T
(at Ambient Temperature)
= T
J
50
= T
JA
Table
CASE
can be used for a first order approxi-
A
LOAD CAPACITANCE (pF)
+
Operating Conditions on
42.
+
T
100
JA
<
JT
u P
u
D
P
D
150
Rev. 0 | Page 45 of 48 | June 2007
200
Values of T
design considerations. Note that the thermal characteristics val-
ues provided in
Table 42. Thermal Characteristics for 208-Lead MQFP
Parameter
T
T
T
T
<
<
<
JA
JMA
JMA
JC
JT
JMT
JMT
JB
are provided for package comparison and PCB
Table 42
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
are modeled values.
Typical
30.82
27.53
26.22
14.04
2.0
2.65
3.12
ADSP-21371
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W