Hi,
For K70 has two DAC modules, customer can use one DAC module output 3.3V voltage and another DAC module output 1.8V voltage.
The K70 is single voltage powered, if customer using VDD 3.3V, then customer also could use one GPIO pin output 3.3V voltage and using a DAC module output 1.8V voltage.
Wish it helps.
best regards,
Ma Hui