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DAC8163: DAC8163 default output under internal ref.

Nam, Dino
Expert 6445 points

Part Number: DAC8163

Dear team, 

Regarding DAC8163 default output after POR, 

At datasheet, I can find " At power up, all DAC registers are reset to mid-scale code and the output voltages of all DAC channels are set to VREFIN / 2 volts"

If the customer use internal ref, after power up, we can see DAC output voltage is 0 due to no ref voltage (The internal reference is powered off or down by default)

And then, After internal reference enabled, we can see 2.5V output on VREFIN/out port. Under this status, Is the DAC output voltage 1.25V( VREFIN / 2) or 2.5V output(x2 gain)?? 

And DAC max input data is 0x7000 or 0x4000?? 

 Let me know your opinion. 

  • 0
    TI__Mastermind 19136 points

    Hi,

    DAC8163 has internal reference disabled by default. Also at power up all DAC registers are default to mid code and output will according to the transfer function 

    (Din/2^n) * Vref * Gain

    In internal reference mode, Gain will be 2 

    So full code output will be 5V and mid code will be 2.5V

    DAC data is straight binary max data is 0xFFFF

    Regards,

    AK

  • 0 in reply to Akhilesh K
    TI__Expert 6445 points

    Hi AK, 

    Thank you for your comment. 

    one more question. 

    At datasheet,

    DIN ranges from 0 to 2 n – 1. In case of DAC8163, 14bit DAC. input range is 0 to 2^14 -1(16383) then max data is 0x3FFF(Decimal, 16383).

    Is it a misunderstanding?

    Let me know your opinion. 

    Thank you. 

  • 0 in reply to Nam, Dino
    TI__Mastermind 19136 points

    Hi,

    Yes, you are correct, for 14 bit in hex, max code will be 0x3FFF

    What I meant was for 16bit variant of the same. Also make a note, even though DAC8163 is 14bit, DATA_REG is 16 bit with last two bits is don't care.

    Regards,

    AK