I have read the AD790 datasheet.
It is a question about the operating range of the AD790.
The AD790 data sheet says "Dual? 15 V Supply Operation".
And the AD 790 data sheet says "ABSOLUTE MAXIMUM RATINGS Supply Voltage ± 18 V".
The AD790 has a GROUND terminal.
In case When saying the data sheet is ± 18 V, is it relative to the GROUND terminal?