I am currently using the signal on one ADC input port to control an index selectable multiband filter with 16 rows (see enclosed jpeg-file).
The signal on the ADC input port is generated by a 4-bit R2R-network. Obviously the R2R-network doesn't deliver the right values that are expected by the filter cell (e.g. it delivers a maximum voltage of 2.6 volts instead of 3 volts for full-scale of the ADC).
Is there any chance to convert the 16 values coming from the R2R-network with a lookup table? I have already tried several things, but nothing's seem to work.
Another application for such a conversion would be to convert the signal from a linear potentiometer into a logarithmic signal to control a SW volume cell.
I have already read the AN-951, where something similar is mentioned, but I have no clue to make it functionable for my project.
Any help is highly appreciated. Thanks in advance
P.S.: I use the ADAU1701