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CEM3394 interfacing with a microcontroller - SynthWizard - 06-18-2021
CEM3394 interfacing with a microcontroller
If you have a look at the multi track block diagram, just after the DAC there is a DAC output buffer and a DAC sign bit inverter, both connected to a 4051 "DAC sign bit switch". The range limiting is probably done in software.
https://electro-music.com/forum/viewtopic.php?p=449395#449395