TMS320F28377S: tms320f28377s

Hi Jingtai,

The on chip DACs range are set by VSSA on the low side and the DAC reference on the high side.  The DAC high reference can be either the VREFHI pin or the VDAC pin.  In both cases, VREFHI < VDDA is required at all times. (VDDA is nominally 3.3V)

There is also a further limitation on the linear output range of the DAC:

Thanks for your reply

Is it possible to apply the on chip DACs as the DAC is DAC8811 does? i.e. This four-quadrant multiplying DAC (MDAC) circuit
conditions the current output of an MDAC into a
symmetrical bipolar voltage. The design uses an op
amp in a transimpedance configuration to convert the
MDAC current into a voltage. This stage is followed
by an additional amplifier in a summing configuration
to apply an offset voltage. The fundamentals of this
design can be extended to realize any symmetric or
non-symmetric output voltage.

Hi Jingtai,

The output of an on-chip DAC is a voltage and not a current and the DAC reference input has a relatively narrow valid range, so I don't think it would meet the definition of a multiplying DAC even with external circuitry.

However, if you just need a bipolar output you could certainly build an op-amp circuit on the output to transform the DAC output voltage range into whatever voltage range you desire (but this won't use the same topology presented in the DAC8811 datasheet).

I'm going to use the DACs in TMS320F28377S based on the application in the documentation TIPD125 therefore I'll disable the buffer in DAC. I have read documentation SPRS881, SPRZ422, SPRUHX5, SPRUH430 but there are no more information about how using the DAC. Can you inform me the link?

Hi Jingtai,

To use the DAC in CCS, the best place to start would be to take a look a the various buffdac_ examples in ControlSUITE in the directory

\controlSUITE\device_support\F2837xS\v210\F2837xS_examples_Cpu1\

As far as the electrical specifications, pin locations, and detailed usage information for the DAC, the documents you have linked should be the correct place to look (although I am not sure what the last document is).

Thanks. I'll download the Controlsuite.