I made a measurement circuit that must read with respect to the GND +/- 10V on the analog input pin, and I used your LTC1855.
I made the wiring diagram as per datasheet and I configured the channel in single ended mode.
But to my surprise I can only measure +/- 5V. If I apply + 5V I read the value 0x1FFF (positive full scale) if I increase the input voltage the reading becomes negative.
How should I configure to read +/- 10 Volt full scale, range indicated in the data sheet?
I attach the wiring diagram
Thanks in advance.