A MEMS device (micro-electro-mechanical system) is a mechanical structure fabricated on a semiconductor die. In the case of a MEMS microphone, a diaphragm is fabricated on a silicon die. A top or bottom sound port is then fabricated in the package to allow sound to enter. Once sound enters, it causes movement of the diaphragm and the movement produces an electrical signal that is amplified and buffered by an electronic circuit in the microphone package. In some MEMS microphones, an analog waveform is provided as the output signal. However, the inclusion of electronic circuits in the microphone enables an analog-to-digital converter (ADC) to convert the analog output signal to a digital signal inside the microphone. This digital signal is less susceptible to electronic noise than an analog output signal and is a convenient format if the output is being sent to a digital circuit.