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NXP used to have 74ABT SPICE models, see e.g. https://groups.io/g/LTspice/topic/simulating_74abt04_hex/105363417
SPICE model can be expected to represent nonlinear CMOS driver characteristic quite exactly, in most cases an equivalent linear driver impedance should give acceptable results.
Ferrite beads at audio I/O connectors are most likely there to keep EMC standards, no necessarily required for repair.
You can select ferrite bead by size. Most manufacturers don't have more than 2 or maximal 3 different ferrite materials for beads on leads, you can choose the material with...
Yes. This will be done in icepack. Depending on analysis objectives, you possibly need to add details to the board model, e.g. copper planes or thermal vias.
There are free tools like FreeCAD.
To get 5V output, you'll supply about 5.5 - 6V to SG3525 Vc pin. Apparently actual Vc voltage is too low.
We don't know which modules you are using and how they connect Vc.
We don't know enough about the application to determine if hardware sensor calibration is feasible. It's however obvious that resolution at 25 S/s will be noise limited. A detailed calculation is necessary as design starting point.
You are right, I overlooked the divider. I appreciate your approach to break down the problem into detail measurements. However post #3 sample variance already shows a serious problem of the test setup.
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Comparing the variance of low R_t and high R_t measurements suggests that we see...
I think it's not the appropriate ADC for your application. (25 S/s, nV resolution). If these are strain gauge bridges, we would use modulated bridge supply if ever possible, eliminating the need for offset compensation. If not possible some kind of auto-zero would be applied. It's your job to...
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