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DAC7554: REFIN > VDD

Mark Guastaferro
Genius 11185 points
Part Number: DAC7554

Can DAC7554 be powered with VDD = 3.3V, but REFIN = 5V?  

I think REFIN needs to be less than VDD for typical operation since the output buffer is powered by VDD.

However,  if the DAC input was restricted such that the output voltage would never be programmed above VDD, is this acceptable?  

Or maybe there are other internal paths to be concerned about such as ESD diodes between REFIN and VDD that would conduct under this condition?

  • 0
    TI__Guru 53173 points

    Hi Mark,

    You are correct about the ESD diodes limiting the reference input.  The reference should not exceed VDD to prevent the ESD cells from activating and shunting the reference to VDD.

    See the section titled "DAC External Reference Input" in the product datasheet.

    Thanks,

    Paul