The MAX9396 consists of a 2:1 multiplexer and a 1:2 demultiplexer with loopback. The multiplexer section (channel B) accepts two differential inputs and generates a single differential output. The demultiplexer section (channel A) accepts a single differential input and generates two parallel differential outputs. The MAX9396 features a loopback mode that connects the input of channel A to the output of channel B and connects the selected input of channel B to the outputs of channel A.