I'm currently working on a project that will incorporate an AD7124-8 ADC, which as far as I understand can accept true bipolar inputs when provided a split supply. I tried to dig around for an app note or reference design from AD on this, but couldn't seem to find anything.
My questions are
- What is the typical way to go about providing such a supply?
- What parameters do I need to pay close attention to?
- Will I also need to provide a separate split reference?
My current approach is to use a charge pump to convert 3.3V to -3.3v, then an LDO to get -1.8V;
- If this is the right approach, can I use the same LDO on both positive and negative rails?