I have a question about the ADC sensitivity for the vAFE in the ST1VAFE3BX. Table 3 of the datasheet says that the input range is +-25mV when the gain is set to 16. With a 12-bit reading, this results in about 12 uV/LSB of resolution. However, the "AH / vAFE channel gain" row of the table lists 1311 LSB/mV, or 0.76 uV/LSB of resolution and mentions "16 bits, input referred". These values seem to conflict. Is the sensitivity 0.76 uV/LSB or 12.2 uV/LSB? This is a huge difference in sensitivity. If 0.76 uV/LSB is achievable, what settings can be used to reach it? According to the datasheet, none of the configurations appear to generate samples with more than 14 bits.
In my experience working with the part, the vAFE samples are always at least 14-bits when using vAFE only mode. When enabling the low-pass filter, I see 16-bits. This also doesn't seem to match the information in the datasheets or application notes, further increasing my confusion.
I would very much appreciate any clarification that can be provided on these topics.
