DAC8162: TUE

Hi Katlyee,

Thank you for sharing unit convertion table.

I try to convert unit and calculate TUE.

Vos(Offset Error)=±4mV=±0.08%FSR     ← Vref=5V

Gain Error = ±0.15%FSR

INL(Relative accuracy)=±3LSB=±0.0183%FSR

TUE=±0.171%FSR

Best Regards,

ttd

Hi ttd, 

Your conversions and calculation look correct. 

Best,

Katlynne Jones

Hi Katlynne,

Thank you for your reply.

I understand the basic calculation method for TUE. Thank you.

The TUE is listed for the DAC8760, but the TUE calculated using the formula is much larger than the listed value.

Q1
The TUE for the DAC8760 also lists the ambient temperature range, so does the TUE include the temperature drift of each error?

Q2
Is the TUE calculated by TI on datasheet like DAC8760, based on actual measurements, or is the calculation method different from general calculation formula(√( (INL)^2 + (Offset Error)^2+(Gain Error)^2 )?

Best Regards,

ttd

Hi ttd, 

The TUE calculation is a very conservative estimate for error. When we include the number in datasheets this is an actual measured value on the device. In reality some errors may be positive while some are negative, and they'll end up cancelling each other out. This is why the measured value is typically better than the calculated value. 

In the DAC8760 datasheet there are a few temperature ranges. When it says TA = 25C then this is just the typical room temperature specs. The others that are across the temperature range include the drift (remember this is a measured value). 

Best,

Katlynne Jones