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AD9523-1/PCBZ 数据表(PDF) 39 Page - Analog Devices

部件名 AD9523-1/PCBZ
功能描述  Low Jitter Clock Generator
PDF  60 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD9523-1/PCBZ 数据表(HTML) 39 Page - Analog Devices

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AD9523-1
Rev. B | Page 39 of 60
The second step is to multiply the power dissipated by the thermal
impedance to determine the maximum power gradient. For
this example, a thermal impedance of θJA = 20.1°C/W was used.
Example 1
(966 mW × 20.1°C/W) = 19.4°C
With an ambient temperature of 85°C, the junction temperature is
TJ = 85°C + 19.4°C = 104°C
This junction temperature is below the maximum allowable.
Example 2
(2500 mW × 20.1°C/W) = 50.2°C
With an ambient temperature of 85°C, the junction temperature is
TJ = 85°C + 50°C = 135°C
This junction temperature is above the maximum allowable. The
ambient temperature must be lowered by 20°C to operate in the
condition of Example 2.
THERMALLY ENHANCED PACKAGE MOUNTING
GUIDELINES
Refer to 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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