Аудио-википедия

es9012-9018.pdf

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Just a quick query because I can't seem to find anything but simple 2-page PDF datasheets for ESS DAC chips…

I assume all ESS dac chips (9018, 9023, etc.) are VOLTAGE OUT. So, no need for I/V. Is this correct?

In short, yes. ES9018 and its derivatives can support voltage mode or current mode. It depends on the input impedance where the next stage has. When it sees a low impedance, it's current mode. ES9023 has integrated amp for voltage out. I don't know if it can support current output.