Digital microphone device

摘要

A microphone device having input terminals for receiving an input analog signal and output terminals to produce an output digital signal. The microphone device includes a converter circuit having input terminals coupled to the input terminals of the microphone device and an output terminal coupled to the output terminals of the microphone and an output terminal coupled to the output terminals of the microphone device. The device includes an analog input interface having input terminals corresponding to the input terminals of the microphone device and first and second output terminals to produce an amplified analog voltage signal, a converter circuit having first and second input terminals corresponding respectively to the first and the second output terminals of the analog input interface and an output terminal to produce a digital voltage signal and a parallel to serial digital output interface having an input terminal corresponding to the output terminal of the converter circuit and output terminals corresponding to the output terminals of the microphone device. The converter circuit desirably includes a signal modulator circuit having an input terminal coupled to the input terminals of the converter circuit and an output terminal to produce an intermediate digital voltage signal and a signal sampler circuit having an input terminal corresponding to the output terminal of the signal modulator circuit and an output terminal corresponding to the output terminal of the converter circuit.