Hi,
Instead of the confusing textual descriptions you should use a simple drawing.
--> It makes no sense to invert SPI lines. Juse invert the DAC output.
Klaus
Hi Klasus,
Thanks for the reply.
Here is the circuit i simulated, as you suggested .
I considered resistance mismatch, and offset voltage of the op-amp.
I do have some Questions for my complete understanding:
1) What are the consideration for Resistance value selection?
My thinking is to have 2 resistance value larger than 10K, (With <0.02% Tolerance), So That the trace resistance will not contribute much to the over error.
Also Since My input are DC, I do not care about the speed. Does this make sense?
2) For the op amp,
I know that V_offset will contribute some errors, What other errors from Op-amp could impact to my circuit? et offset current
3)For the op amp, Can i just tie the VCC+ to the ground, and Vcc- to -5V? What is the problem with that?
Also, I was suggested to use rail to rail op-amp, Why does rail to rail matter?
4)For the op amp, I have the option to tie the VCC+/- to 5v or 3.3V. Does it matter in terms of output accuracy?
Thank you so much for your helps,
Eddy