Hello,
- What could trigger an ADC fault, besides the high switching frequency (above 50kHz) ? We are (sometimes) seeing an ADC fault when switching at 20kHz with continuous sampling mode. What could be the reason ?
- The fault occurs on a running system, but wasn't able to replicate it on the bench.
- In the datasheet, we can see "Operating the output at frequencies greater than the recommended maximum may cause FIFO (first in, first out) buffer to fill up, triggering FAULT1[ADC_FAULT]." and also "ADC_FAULT may be indicated when INP signal is greater than recommended max". is it dependent on the output or input?
- In case it's output dependent, could a glitch on the ASC_EN pin (>tASC_HLD) resulting in an "apparent" high frequency switching, trigger an ADC fault ?
- Is there any dependency to the actual ADC input level and/or noise? forcing the AIx to voltage to voltage higher than the FS (4V) does not trigger a fault.
Thanks
Yassine