I've had problems finding information on how AIN4-AIN7 are connected internally in the ADuCM355. They are not included on any of the AFE die/switch matrix figures in UG-1262 or the Datasheet other than in "Figure 8. ADC Input Stages" in UG-1262, where it is shown as if AIN0-AIN7 are direct inputs to the ADC. In other figures, AIN0-AIN3 are a part of the switch matrix.
Does this mean that AIN0-AIN3 are a part of the switch as seen in Figure 26, UG-1262, and that AIN4-AIN7 are direct inputs to the ADC with no other connection options?
Yes, your last sentence is correct.
AIN4-AIN7 are direct voltage inputs to the ADC MUX and are not connected to the Switch Matrix.
AIN0-3 have direct connections to the ADC MUX (same as AIN4…
AIN0-3 have direct connections to the ADC MUX (same as AIN4-7) but, they also are connected the Switch matrix - so can be current inputs to the HSTIA.
Great, thanks Mike!