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Will a +-12V supply for the analog section of the DAC7741 EVM work?

Umar Khan
Intellectual 320 points
Other Parts Discussed in Thread: DAC7741

Hi, 

     I am planning to use the DAC7741 EVM to dirve the input of a  piezo amplifier. The specifications of the DAC7741EVM state that the supply voltage for the analog section must be +-15V. Is it ok if I supply  +-12V instead? I believe that doing so will only limit the rail to rail voltage of the opamp in the EVM and eventually will reduce the output range of the EVM. Is this correct or will providing +-12 V stop the EVM from working completely? 

Thanks.

  • 0
    TI__Mastermind 43915 points

    Hi Umar,

    The supply voltage range is +/-11.4V to 15V so supplies of +/-12V are fine to supply to the chip and the EVM. You will be limiting the swing of the op amp used to drive the reference voltage as well as the REFin max if you decide on using an external reference versus using the DAC's internal reference. The max input reference voltage is VCC - 1.4V so, using a 11.4V VCC supply will limit your max REFin to 10V (which is the same value as the internal reference).

    Regards,

    Tony Calabria

  • 0 in reply to Tony Calabria
    Intellectual 320 points

    Hi Tony,

           Thanks for the information. This solves my query.

    Umar.