Hello TI team,
We are planing to use the ADS9218 with a differential LC filter at its input, driven by a fully differential amplifier. In The datasheet under recommended opperating conditions it is stated, that the input common mode voltage should not exceed Vocm+-0.025V (i assume the test conditions should read (Ainxp+Ainxm)/2 not (Ainxp-Ainxm)/2), however since in our desing the differential amplifier is on the other side of the filter, the tolerances of the passive components (especially regarding ESR) will not allow for this much precision.
Hence my question is: what is expected to happen if the input common mode voltage is not within this specification but the diffferential mode input is still within the specified limit of +-3.2V and all inputs are within the single ended range of 0.7V..4.1V?
Thanks and best regards
Jerome Kaufmann