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AD9548 Thermal Performance

Question asked by Dvorkin on Oct 20, 2011
Latest reply on Oct 20, 2011 by pkern


What does the phrase in AD9548 datasheet (page 106, "Thermal Performance" chapter) mean:

The AD9548 is specified for a case temperature (TCASE).


There are parameter from AD9548 datasheet:

Operating Temperature Range −40°C to +85°C

Is the +85°C maximum ambient temperature, or maximum case temperature?
TJ = TA + (θJA × PD)
If PD=1.5W, Ta=+70°C, θJA=18°C/W,  then Tj will be +97°C. Will it be normal device operation (max Junction Temperature is 150°C according to the datasheet)?