Here is some very general advice. Learn the basics of LTSpice and use it, even for simple circuits. Never perfect, but it's a great way to learn things like "what would happen if I injected a...
Type: Posts; User: jonr
Here is some very general advice. Learn the basics of LTSpice and use it, even for simple circuits. Never perfect, but it's a great way to learn things like "what would happen if I injected a...
> a virtual GND of 1.65V and power the AD8224 with +-3.3V)?
You would want the AD8224 to operate without a virtual ground. And the 2nd stage needs power too. Probably not worth the changes,...
You could also add an inverting charge pump - the AD8224 will run on 3.3V and -3.3V.
Your first graph has a scale that goes negative. But in single ended mode, the output of the ADC is unsigned. Mix up signed and unsigned and you get strange jumps at 32767.