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.