Part Number:TMS320F280049
Dear Champs,
If internal ADC reference is used, should we connect VREFHIx to VDDA directly?
From F280049 control card schematic doc, it says
"S8 chooses whether the internal or external voltage reference will be used
a) The ADC's respective switch in S8 is on
b) The respective ADC's switch in S8 is off
- ADC should be configured to disable the internal reference and
- ADC should use the internal voltage reference
instead a reference voltage should be attached to HSEC pin 45"
When S8 is off, doesn't it mean the VREFHIx are connected to VSSA?
However, in F280049 datasheet (sprs945c.pdf), Table 4-10 Connections of Unused Pin shows the unused VREFHIx should be connected to VDDA directly.
We are confused.
Wayne