MCP4725 100kbps, 400kbps, 3.4Mbps Modes

Can someone please tell me how I would access / use the different modes on this module?

Sorry, to be a bit more specific. The three modes: standard 100kbps, fast 400kbps and high speed 3.4Mbps. I am programing in Python. While testing we are running into the occasional (Error 121). I am not sure if this is a power supply issue or some kind of data transmission issue.