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DAC128S085 Minimum Reference Voltage Across Temp Range

Jamie Happ37
Prodigy 10 points
Other Parts Discussed in Thread: DAC128S085

I am in the process of designing board hardware using the DAC128S085 (12-bit DAC) and need some clarification regarding the voltage range for VREF1 and VREF2 in the datasheet.

On page 1, section 3 (description) of the DAC128S085 datasheet (SNAS407H-April 2015 revised), it states that each reference can be set independently between 0.5V and Va.  Likewise, in table 7.3, Recommended Operating Conditions, the reference voltage, Vref1,2, over the operating free-air temperature range is specified with a minimum of 0.5V and maximum of Va.

However, in table 7.5, Electrical Characteristics, under "REFERENCE INPUT CHARACTERISTICS", the VREF1,2 input range minimum is specified as 0.5V TYP and 2.7V MIN (Tmin<Ta<Tmax).

If the device will operate over the entire operating temperature range, is the minimum reference voltage really 2.7V, or is it 0.5V?  If 2.7V is the minimum over the entire temp range (Tmin<Ta<Tmax), over what temperature range can a 0.5V reference voltage be used?

Thanks,

Jamie

  • 0
    TI__Genius 16890 points
    Hi Jamie,

    That means that the part can work with the reference voltage down to 0.5V at room temperature. Over the temperature spread of Tmin to Tmax Vref needs to be between 2.7V and VA.

    This comes from the when the part was characterized during development, the data was taken over the temperature range for Vref between 2.7V and VA. The part works when Vref is 0.5V but no temperature characterization data was taken over temperature so it can't be guaranteed.

    Mike