DAC60502: Headroom and footroom

Avatar

Part Number: DAC60502

DACx0502 data sheet states that "Output voltage footroom" is 0.3v (min) with Iout = 10mA. Assuming Iout is extremely low (e.g., < 10uA at all Vout voltages) can we assume that Vout = 0.00v for Digital code 0 and likewise Vout = 5.00v (gain = 2x, internal reference) for the max. output code?

Is the headroom / footroom specification strictly to accomodate large Iout currents?

over 2 years ago

0 Akhilesh K over 2 years ago

TI__Mastermind 18556 points

Hi,

Specification for headroom is written for 10mA sourcing current, similarly footroom is defined for 10mA sinking current.

If the DAC is unloaded, you caN expect values close to 0V and 5V ( for zero code and full code) respectively.

Being said that, at any code there will be deviation form ideal voltages defined by Total Unadjusted Error (TUE). For DAC60502, TUE is 0.1%FSR (max).

Assuming your full scale voltage is 5V, you can have error as high as 5mV at any code.

so for zero code, Vout = 5mV(max) and full code Vout = 5V - 5mV (max)

Hope this clarifies.

Regards,

+1 Avatar over 2 years ago in reply to Akhilesh K

Intellectual 420 points

Thanks.

0 Avatar over 2 years ago in reply to Akhilesh K

Intellectual 420 points

I apologize. I think I may have clicked on "report as abusive" by accident. Can't see how to undo this. I am sorry.

0 Akhilesh K over 2 years ago in reply to Avatar

TI__Mastermind 18556 points

Hi,

No issues.

Regards,

Data converters

Data converters forum

DAC60502: Headroom and footroom