A bit confused by the In SPRS797B (July 2014) the device comparison section for TMS320F28052F states there are:
4 PGAs
3 fixed gain amps
1 buffered reference DAC
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Regarding the DAC, figure 6-24 shows a 6 bit DAC connected to "CMP1" that in turn drives the signal Vrefout/AO. Should CMP1 be a follower as in Fig 6-26? )
Regarding the PGAs - SPRUHE5d in section 7.1.1 states "The gain selection is software programmable through the AMPxx_GAIN registers, but one or more of
these registers may be locked on some devices. See the device data manual to determine if the PGA gain is software-selectable or if the gain is locked to a fixed selection."
Its not clear where to look to see if what is actually programmable.
Does the TMS320F28052F have 4 programmable gain PGAs, and 3 fixed gain amps (for a total of 7 independent) input amps? If some of the PGAs are locked, what gain do they have? What document do I reference?
Thank you.
Chris