Circuits from the Lab™ reference circuits are engineered and tested for quick and easy system integration to help solve today’s analog, mixed-signal, and RF design challenges.
This document provides a circuit design for connecting up to two ADMP441 digital MEMS microphones to an ADAU1446 SigmaDSP audio processor. The design allows stereo microphones to be used without an external codec by utilizing the processor's serial data inputs. The circuit requires minimal passive components, specifically a bypass capacitor and a pull-down resistor on the serial data line.
| Microphone Sensitivity | -26 dBFS |
|---|---|
| Max SigmaDSP Gain | 24 dB |
Up to two digital MEMS microphones can be interfaced to an audio processor on a single data line.
Up to eighteen ADMP441 microphones can be input to a single audio processor.
The SigmaStudio software is used to program and tune the registers and SigmaDSP core.