Lt1568 configured as 4th order Butterworth band pass filter for 4Mhz has excessive heating.

Hello ,

I'm using a Lt1568 configured as 4th order Butterworth band pass filter for 4Mhz  and  signals ; 

It works as expected but manifests excessive heating (> 40 ° C) despite no output load.
signal; 4Mhz 2Vpp square wave.
Supply +-5v l.

can you give me some indication? or suggestion?

Thanks a lot 

Pierantonio