and where should the exposed pad be connected to?
The ADA4661-2 and the ADA4666-2 are dual amplifiers and are available in the
popular package of 8-lead MSOP and LFCSP (3mmx3mm) with industry standard pin
outs. For the LFCSP package, connect the exposed paddle to the lower supply
rail (V-) or leave it unconnected.