Patent ID: 8433084

Claim:
A microelectromechanical acoustic transducer assembly, comprising: a microelectromechanical system (MEMS) sensing structure including a sensing capacitor that includes: a rigid electrode; and a membrane integrated in a first die of semiconductor material, the membrane having a first surface in fluid communication with a front chamber and a second surface, opposite to the first surface, in fluid communication with a back chamber, said membrane being configured to undergo deformation as a function of incident acoustic-pressure waves from said front chamber, and facing the rigid electrode, the sensing capacitor having capacitance that varies as a function of the deformation of said membrane; an electronic circuit integrated in a second die of semiconductor material, operatively coupled to said MEMS sensing structure, and configured to supply an electrical output signal as a function of the capacitive variation of said sensing capacitor; and a package configured to house said first die and said second die and including a base substrate carrying electrical contacts for connection of said microelectromechanical acoustic transducer assembly externally, wherein: said first die and said second die are stacked on one another in said package and are directly connected together mechanically and electrically, said package directly delimits a first side at least one of said front chamber and said back chamber and the membrane delimits a second side of the at least one of said front chamber and said back chamber, said first die includes a substrate having an active surface at which said membrane is arranged, and a rear surface starting from which the back chamber extends, through said substrate to said membrane; and said second die is stacked on said first die and has a facing surface facing said active surface of said first die so as to be arranged over said membrane.