Part Number: TMS320F280049C
How does the TMS320F280049C buffered DAC output enable work?
From the TRF, we have the lovely block diagram of the buffered DAC snipped below. Now, there is the DACOUTEN register which is supposedly used to "disable" and "enable" the DAC, however it is not at all clear how this is achieved, as this is not shown on the diagram. In the initialisation sequence section, is says that DACOUTEN powers up the peripheral, but there are no other details. What is the impedance state of the output buffer when turned off?
The crux of this question is because the DAC is being used for loopback testing, and it is being externally fed into the PGA input which is used for current sensing. If the DAC is disabled, how might it affect the sensing? I have tested this on hardware, and initial results suggest it does not affect the sensing. However, I would like to know how it works nonetheless.
