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Microphone interface IC

STMicroelectronics designed a complete microphone interface on a miniature chip to support diverse audio-enabled applications; the EMIF02-MIC07F3 integrates the complete noise filtering, ESD (electrostatic discharge) protection and biasing for one microphone in a single IC occupying only 1.37 mm². The single chip replaces multiple discrete components that consume at least 20.8 mm². The IC uses ST’s advanced PZT (Lead Zirconium Titanate) process, which allows high capacitance values within ultra-miniature dimensions. This gives designers extra freedom to optimise the filter characteristics. In addition, as ST fabricates all the components on a single chip, close matching between the capacitor and resistor values produces more repeatable performance than is possible with discrete components. Samples of the EMIF02-MIC07F3 are available now, in 8-bump lead-free flip-chip IPAD package. The device will be priced at $0.25 in quantities of 5000.

STMicroelectronics, www.st.com/stonline/products/literature/ds/17052/emif02-mic07f3.pdf