The Microphone reference design connects to an EZ-B ADC port, then ARC converts the voltage levels into sound data. We want to share these files with you so you can create your own!


  • 3.3V voltage regulator on-board
  • Full human audible range 20Hz-20kHz
  • Audio input to 2-stage amplified analog voltage output
  • Single supply amplifier
  • Green Power LED
  • Voltage requirements: 3.2-16V (3.3V typical)
  • Current draw: 1.2mA
  • Dimensions: 16.2(W) x 39.5(L) x 7.8(H) (mm)
  • Weight: 4g

  • Major Components

  • CMA-4544PF-W Analog condenser microphone (-44dB)
  • OPA2344UA/2K5 Opamp 1MHz
  • SPX3819M5-L-3-3/TR 3.3V Regulator

  • Manufacturing Notes

  • Manufacturer: Single side placement and soldering of SMT components
  • Manufacturer: Single Side soldering of THT component

  • Resources

    Documentation: Schematic PDF, Datasheet PDF, BOM

    Hardware: Altium PCB design File, Altium SCH Design File

    Altium Libraries are also available here