We have a use-case where we want to operate the AFE4410 in variable configurations, some of which require different pairs of two LEDs to be sampled simultaneously, others require the same two LEDs to be sampled separately. When two LEDs are sampled simultaneously, at least one of those LED is configured to enable during a sampling phase that nominally belongs to a different LED. In that case, which settings get applied for I_OFFDAC and TIA_GAIN, a) during the simultaneous LED phase and b) during the ambient phase with no LED phase configured?
From the data-sheet, it appears that, for I_OFFDAC, it appears that it depends on EARLY_OFFSET_DAC: When set, the offset current is set with the LED phase, otherwise it is set with the sampling phase. If that assessment is correct, what I_OFFDAC will be effective during the ambient phase with no LED configured if EARLY_OFFSET_DAC is set?
Similarly, for the TIA_GAIN, the datasheet indicates that, with ENSEPGAIN4 set, the gain (and Cf) values are switched whenever the LED phase begins. Again, what gain will be active during the no-LED ambient phases?
More specifically, is it possible to use a mode were LED1 & LED2 are enabled together and still achieve a dynamically different I_OFFDAC and/or TIA_GAIN for another phase with LED3 or LED4 enabled?
