Design note describing how to connect ADMP404 MEMS microphones to the ADAU1761 SigmaDSP audio codec.
The CN‑0207 circuit note provides a complete reference design that links up to two ADMP404 iMEMS analog microphones with an ADAU1761 low‑power stereo audio codec. It includes the schematic, layout files, bill of materials, and required register settings for the SigmaDSP processor.
The document also details evaluation board connections, recommended passive component values, and software setup using SigmaStudio. Links to the full design‑support package and related datasheets are provided for further integration work. This manual is written in Chinese.
| ADMP404 sensitivity | -38 dBV |
|---|---|
| Maximum PGA gain | 35.25 dB |
| ADMP404 supply voltage range | 1.5 V to 3.6 V |
| ADAU1761 supply voltage range | 1.8 V to 3.3 V |
You need the ADAU1761 evaluation board (EVAL‑ADAU1761Z) and the ADMP404 evaluation board (EVAL‑ADMP404Z‑FLEX).
Yes, ADMP401 and ADMP405 are compatible alternatives, with ADMP401 having –42 dBV sensitivity and ADMP405 a 200 Hz low‑frequency cutoff.
SigmaStudio GUI is used on a Windows PC to set the ADAU1761 registers and SigmaDSP core.