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AD9528 Fiches technique(PDF) 48 Page - Analog Devices

No de pièce AD9528
Description  Maximum output frequency
PDF  68 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD9528 Fiches technique(HTML) 48 Page - Analog Devices

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Data Sheet
AD9528
Rev. C | Page 47 of 67
The second step in evaluating the operating conditions is to
multiply the power dissipated by the thermal impedance to
determine the maximum power gradient. For this example, a
thermal impedance of θJA = 21.1°C/W was used.
Example 1
(1358 mW × 21.1°C/W) = 29°C
With an ambient temperature of 85°C, the junction temperature is
TJ = 85°C + 29°C = 114°C
This junction temperature is below the maximum allowable.
Example 2
(1630 mW × 21.1°C/W) = 34°C
With an ambient temperature of 85°C, the junction temperature is
TJ = 85°C + 34°C = 119°C
This junction temperature is greater than the maximum
allowable. The ambient temperature must be lowered by 4°C to
operate in the condition of Example 2.
THERMALLY ENHANCED PACKAGE MOUNTING
GUIDELINES
See the AN-772 Application Note, A Design and Manufacturing
Guide for the Lead Frame Chip Scale Package (LFCSP), for more
information about mounting devices with an exposed paddle.



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