To calculate the minimum number of bits required to achieve a specific resolution in an analog-to-digital converter (ADC), we can use the formula:
N = log2 (Range/Resolution)
Where N is the number of bits, Range is the maximum voltage range, and Resolution is the desired resolution.
In this case, the maximum voltage range is ±115V. However, it is not specified what resolution you want to achieve. To calculate the minimum number of bits for a specific resolution, please provide the desired resolution in volts. In addition, please provide the number of discrete levels you want to represent in the digital signal.