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SPI of F28069

Hi All,

              I have configured SPI of F28069 in Master Mode and I sent signal through SPIA and SPIB which are connected to DAC MCP4921 to both channels at a time but the output on the DAC I am getting a different value for channel SPIA and SPIB, please any one can tell me why this happening.

Thanks in advance

Naveen

  • Naveen,

    How different(in DAC LSBs) are the DAC outputs?  I looked in the MCP4921 DS and couldn't find any info on DAC/DAC between the 2 on-chip DACs; so we have to assume the worst case spread in their overall accuracies; in this case if I use the typical for gain and INL(offset is very negligible to this equation) I get about 4.5 codes of error from ideal.  Is the delta between the 2 outputs in this range?


    Matt