Digital Microphone Applications and System Partitioning
by Arie van Rhijn, National Semiconductor

Almost every audio application will convert the input audio signal into a digital representation to further process the information. Since real-world audio signals are small analog signals, there are often two distinct functions at the input of these systems: (pre) amplification and A/D conversion. National Semiconductor has developed an integrated circuit (IC) that, by replacing the JFET in a conventional electret condenser microphone (ECM), will result in a fully digital output from an ECM. This easy-to-manufacture, four-wire ECM has only power, ground, clock, and data connections, completely eliminating the sensitive low-level analog signal present on a conventional ECM.

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