AKD7755-B is an evaluation board that supports the AK7755 mono ADC, stereo audio codec, microphone preamplifier, line output amplifier, and a highly integrated digital signal processor with a built-in digital audio interface. This board is composed of a main board and a sub board. It is possible to control the setting of this board via USB port. This board has digital interface, enabling interfacing to digital audio systems via optical connector and SMUX-PORT.