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DAC8811: DAC8811 behavior without code

Rohit Arora
Intellectual 350 points
Part Number: DAC8811

Hi,

I want to understand the behavior of DAC8811 if there is not SPI interface connected to IC.

I have used 5Vref so it will provide 0mA or 1mA at I out pin without any code?

Regards,

Rohit 

  • 0
    TI__Mastermind 18546 points

    Hi Rohit,

    The initial shift registers are filled with zeros. However both the shift and DAC registers are filled with zeros during the power-on, on most of our devices usually they are set by the time the supply reaches ~2 V. This is because the chip has an OTP (one-time programmable) register that is responsible for setting the DAC to its default state during power-on.

    At power up we recommend that all digital inputs should be at a valid state. Do not float these pins

    When all the codes are at zero, device output should be 0V as per the transfer function. for Full code, Vout  = -Vref

    Vout  = -Vref * (CODE/65536)

    Regards,

    AK

  • 0 in reply to Akhilesh K
    Intellectual 350 points

    Hi Akhilesh,

    SPI interface is connected to controller but  there is not code in the controller.

    In that case I will see 0mA at Iout pin of DAC8811?

    Regards,

    Rohit Arora

  • +1 in reply to Rohit Arora
    TI__Guru 52683 points

    Hi Rohit,

    Yes, the expectation is that you will have 0mA on the output.

    Thanks,

    Paul