DE2-115 with HSMC_ADA from terasic

By the looks of the photos on the Terasic web site, and the fact that the board can connect via HSMC I/Os or via GPIOs, I'd guess that the signals are single-ended 3.3V or 2.5V LVCMOS.

The Terasic HSMC_ADC specification has some pinout details, but its not very explicit, so look at the schematic - I've attached it here.

The board uses 3.3V from the host board. The DE115 has jumpers for the HSMC power supply. You'll need to select 3.3V for the bank power.

The ADC/DAC use parallel buses at whatever speed you clock the ADC/DAC. The ADC and DAC each have a maximum frequency, but you can clock them at whatever frequency you like below that, eg. clock them both at 50MHz.

Cheers,

Dave