Microphone interface chip

1 September 2010 Analogue, Mixed Signal, LSI

As demand continues to grow for smaller dimensions and extra functions in mobile devices, a new integrated circuit (IC) from STMicroelectronics aims to reduce the total space required to embed microphones for a variety of functions.

Consumer electronic applications requiring a microphone are increasing, as users expect to use their PCs for voice calls, use voice commands to control devices such as GPS receivers and automotive systems, and record audio directly onto portable media devices. In addition, mobile devices such as cellphones that have traditionally featured one microphone are now adding extra microphones to support active noise cancellation for improved user experience.

ST’s EMIF02-MIC07F3 is a next-generation device integrating the complete noise filtering, ESD (electrostatic discharge) protection and biasing for one microphone in a single IC occupying only 1,37 mmĖ. The device also enhances performance by using ST’s advanced PZT (Lead Zirconium Titanate) process, which allows high capacitance values within miniature dimensions. This gives designers extra freedom to optimise the filter characteristics. In addition, as all of the interface components are fabricated on a single chip, close matching between the capacitor and resistor values produces more repeatable performance than is possible with discrete components, which ultimately enhances the quality of the end product.

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