I use four ADG5412 in my design, but two of them do not work correctly. When the channel is on, the ADG5412 work OK, but when the channel is in off state, the output of the channel has a offset voltage. One of the breaken ADG5412 has a offset voltage of 1.62V, and the other has a offset voltage of -0.117V. What is the possible reason for these unwanted voltages?
Besides, I provide the ADG5412 with a supply of +/-12V.