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AD9240 issue with Lower Temperature Application(-40℃)

Question asked by on Jan 13, 2014
Latest reply on Jan 14, 2014 by PMH


Now I has a issue about AD9240 in Low Temperature applicaiton:

AD9240(SCH is as following) could work normally in normal temperature(25℃/0℃/-10℃), but when in Lower Temperature(-20℃/-40℃), we found it work unnormal.

Firstly, we couldn't fix the problem, and we had to confirm that by replacing related device;

Finally, we found that, replace C399/C398 could solve this issus completely.

But I wonder to know, is there any special requirement with C399/C398 in Low Temperature application? such as ESR.

How I select the Cap(C399/C398) to adapt lower temperature? thanks.






Best Regards.