Is it possible to control a AD7690 in the 3-Wire CS Mode (Rev. C, Figure 34) by using the CNV and CNV and SDO lines with only simple digital logic rather than using a microprocessor?
The ICs we make are pretty dumb and don't know where the signals come from on their pins.
You certainly can control the part with logic, but I would not want to use a bunch of gates.
I would use a big CPLD or an FPGA.