This is a product manual from Analog Devices, which introduces the features and characteristics of the ADMP441 Omnidirectional Microphone with Bottom Port and I2S Digital Output product.
This document describes a circuit design that allows up to two digital MEMS microphones (ADMP441) to be interfaced to an ADSP-BF527 Blackfin processor on a single data line. The configuration eliminates the need for a codec between the microphones and the processor by utilizing the I²S output of the microphones directly.
Up to eight ADMP441 microphones can connect to a single DSP because the processor supports up to four serial data inputs.
The ADMP441 has a stated sensitivity of -26 dBFS.