Complete Microphone Interface on a Miniature Chip Supports Diverse Audio Applications
Tue, 11/16/2010 - 7:21am
As demand continues to grow for smaller dimensions and extra functions in mobile devices such as smartphones and other portable devices, a new integrated circuit (IC) from STMicroelectronics reduces the total space required to embed microphones for a variety of functions. 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 1.37mm². The single chip replaces multiple discrete components that consume at least 20.8mm². The EMIF02-MIC07F3 also enhances performance by using ST's advanced PZT (Lead Zirconium Titanate) process, which allows high capacitance values within ultra-miniature dimensions. This gives designers extra freedom to optimize 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.