i'm measuring 30 different voltages without common ground. Each voltage is measured by an AD7401A Sigma-Delta modulator/ADC. The signals go into an FPGA (Xilinx Spartan 6). But the I/O-Pins are limited. So I thought to switch between 2 ADC readings and this 15 times simultaneously. Instead of 30 I/O-Pins I need only 15 + 1 control line for the Muxes (TS3A5018DR). But of course the voltage readings need double the time. First 15 simultaneously readings, then switch to the other 15 and then demodulate their outputs.
Do you think that's implementable? And if so, without much effort in comparison to 30 parallel ADCs? Thanks for your help :)