Still working on the v2 version. Currently doing component placement, which means that (hopefully) the schematics are not going to change much anymore. What analog looks like right now:

• ADC: +-30V input, OPA810 buffer, THS4551 Fully Differential Amplifier, and MCP33131D-10 as ADC (1MSPS, 16 bit). That is ~400 kHz usable signal bandwidth
• A 4-20mA measurement path can be switched with a G6K-2F-Y relay. It'll connect before the 12:1 divider and reuse the same ADC
• For calibration, there's also another G6K-2F-Y relay that can disconnect the input path and connect the DAC so that we can calibrate the DAC to ADC path

Here's the ADC schematic:

The DAC is a 16 bit DAC8551 with an OPA2365 buffer. I have a few TMUX1104 that can switch the path to different voltages: 0-5V, 0-3V, and -+14V. The -+14V is the path that can output to the ADC for calibration.

There's also a 4-20mA output from the DAC. There's another relay that can switch between outputting to the regular path or to the 4-20mA output path.

The DAC schematic:

Lots of parts, which means lots of loader fees at JLC, so let's hope it doesn't need many respins! There are 8 different voltages to work with in the analog section: