MEMS microphone

1. A MEMS microphone, comprising:

a cover;

a housing engaging with the cover for forming a cavity, the housing comprising a base and a sidewall extending perpendicularly from the base;

at least one MEMS transducer accommodated in the cavity, the transducer having a back volume;

and a conductive case covering the cover and the sidewall of the housing for protecting the transducer against interference signals;

wherein the conductive case defines a first part covering the cover, a second part extending from the first part for covering the sidewall and a third part perpendicularly extending from the second part for covering a periphery part of the base, the third part forming an opening;

and wherein the cover is a printed circuit board, and the housing includes circuits embedded therein for electrically connecting with the cover;

and wherein the cover defines a recess, and the sidewall of the housing defines a protrusion for engaging with the recess.

2. The MEMS microphone as described in claim 1 , wherein the cover defines an acoustic hole for receiving acoustic signals.

3. The MEMS microphone as described in claim 2 , wherein the transducer is mounted on the cover and overlaps at least a portion of the acoustic hole.

4. The MEMS microphone as described in claim 2 , wherein the back volume of the transducer communicates with the acoustic hole.

5. The MEMS microphone as described in claim 2 , wherein the conductive case defines an acoustic aperture communicating with the acoustic hole.

6. The MEMS microphone as described in claim 1 , wherein the cover defines a first group of terminals for electrically connecting with the circuits in the sidewall of the housing and a second group of terminals for electrically connecting with the transducer.