I have a few question on AD5293 in datasheet.

1.Based on formula on page 20 in the datasheet about how to calculate RWB and RWA, I have following two questions.

- Is it possible for RWB to achieve 0 ohmn, if D=0?
- Does it mean that the maximum of the RWA is 48.8 kohmn? (assuming using 50kohmn, and D = 1023 maximum)

2.With the wiper resistance (60ohmn typical), how can we calculate the exact resistance?

3."In the zero-scale condition, a finite total wiper resistance of 120 Ω is present. Regardless of the setting in which the part is operating."

Does it mean we can never get 0ohmn for AD5293?

Hi Cklooi,

Apologies for the delay,

1. No it is not possible as there will be a finite wiper resistance of 120Ohm at D=0

Yes, using the formula, that's correct.

2. I'm unclear what you are asking here, the wiper resistance will be in series with the selected resistance.

3. Correct, there will always be a wiper resistance.

Kind Regards,

David