ADA4177-4ARZ Heating issue

Recently, I received sample IC ADA4177-4ARZ from Analog devices. When I just given +15V and -15V supply at pin 4 and 11 respectively, without giving any input and also no output connection, the IC started heating too much. My project requires +15 to -15V. But, I got stuck in the first stage itself. Shall I need to change the IC to some other or can anyone help why such issue arises ?