MSPS Mega Samples Per Second, often used for the Maximum Conversion Rate. It decide the out signal sampling rate.e.g. AD9883 support the 140MSPS, it means it can generate pixel clock output frequencies range up to 140M.
Analog Bandwidth:used to caculate the maximal input signal resolution.e.g. AD9883 support 300Mhz Analog Bandwidth, which means it can support the up to SXGA (1280*1024*75Hz)