Maar Anne was eerder
Likewise, to be explicit: there's no "switch" to turn the ESS DACs into "current mode" versus "voltage mode", that wholly depends on what sort of load you put on the output of the DAC. In "voltage mode" the DAC is loaded with a very high impedance, thus the DAC's output will swing it's entire available voltage range while delivering very little current (proportional to the digital input stream, of course). This is how the boards are presently configured, where the opamp is configured as a noninverting buffer.
