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DAC161P997 internal reference

Bruno Albuquerque
Prodigy 10 points
Other Parts Discussed in Thread: DAC161P997

I wonder what the variation of the output current as a function of voltage component DAC161P997 because this information is not contained in the datasheet. It is not clear if he has an internal reference voltage or using VA as a reference.

With this information we will have to decide whether to use a regulator in the loop with less variation in output, depending on the input voltage.

Thank you, B. Albuquerque

  • 0
    TI__Expert 3135 points

    Hi Bruno,

    The device has its own internal current reference: it is shown in the Block Diagram in the DS (IREF). This reference is not directly observable by the user, but it ultimately affects the accuracy performance of the DAC161P997.

    The internal current reference is responsible for most of the TUE (Total Unadjusted Error) through its components: Gain Error, and Gain Error Temperature Coefficient.

    The above parameters are specified in the Electrical Characteristics table over the VA and temperature ranges.

    In other words we guarantee the accuracy performance of the device over the range of VA=2.7V to 3.6V i.e. your external regulator (LDO) needs to be only 900mV accurate.

    Regards,

     

    tom 

  • 0
    TI__Intellectual 2630 points

    Hello Bruno, On the DAC161P997 the variation of output current is not a function of an external reference or variation on VA. The DAC161P997 has an internal reference. Output current error specs apply over operating range VA = 2.7V to 3.6V as stated in the datasheet.