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TMS320F280049: Buffered DAC output when being set as 0 and 1

Wayne Huang
Genius 17125 points

Part Number: TMS320F280049

Dear Champs,

I am asking this for our customers.

They are asking what the outputs are when they set buffered DAC value as 0 and 1?

Ideal for value 0 should be 0.

Ideal for value 1 should be 3.3/4096

How do they interpret the offset in our datasheet here?

They use internal reference 1.65V (for 3.3V max output).

  • 0
    TI__Expert 7100 points

    Hi Wayne,

    Thanks for your patience.

    I'll get back to you as soon as I get an answer.

    Regards,

    Hadi

  • 0
    TI__Expert 7100 points

    Hi Wayne,

    As yo know offset error shifts all points on the output from what would be the ideal transfer function. The ideal transfer function of a DAC is : y = mx + b; where b is the offset. The offset error is consistent in the linear region (0.3V to 3V). 

    In data sheet it's mentioned the offset error is 10mV, which is equivalent to 13 LSB. As shown in Figure 7-48 and 7-49 in datasheet, the value of DAC changes from 373 to 3722. That being said, it's not possible to get 0V in the output of DAC. 

    Regards,

    Hadi