iUSBDAQ - U120816AO is based on iUSBDAQ - U120816 module. It has almost the same
functions as the iUSBDAQ - U120816, except unlike U120816, it does not provide two PWM
outputs, it converts the two PWM outputs to analog outputs.
Below articles explains how PWM outputs in iUSBDAQ - U120816 or
iUSBDAQ - U1208LOG can be converted to analog outputs and how the software works:
iUSBDAQ - U1208AO can be used as low frequency signal generator
iUSBDAQ PWM outputs can be converted to analog outputs.