Adafruit PDM Mic Module - Qwiic

Adafruits' PDM is the 'third' kind of microphone you can integrate with electronics, apart from analog or I2S.

The first thing to note is that this sensor does not provide an 'analog' output like many of our electret microphone assemblies. So it's great for chips that do not have analog inputs. Secondly, the digital interface is a very simplistic pulse density modulation output. It's digital but its not PWM and it's not I2S. You will need to make sure your chip has a PDM interface - most 32-bit processors these days do.

PDM is a little like 1-bit PWM. You clock the mic with a 1 MHz - 3 MHz clock rate, and on the data line you'll get a square wave out that syncs with the clock. The data line will be 0 or 1 logic output, with the square wave creating a density that when averaged will result in the analog value out.

Quick Spec

  • Voltage Range: 1.8-3.3V
  • Clock Rate: 1 - 3.25 MHz
  • Current Draw: 0.6mA
  • SNR: 61 dB
  • Sensitivity: ~-26 dBFS
  • Product Dimensions: 14 x 14 x 4.5mm
  • Weight: 0.7g

Pinout

  • 3V: This is the power input pin, this powers the chip directly. Use a quiet power supply pin if available. (The chip supports 1.8-3.3V but we have not tested it at 1.8V)
  • GND: Power and data ground reference
  • SEL: Left/Right select. If this pin is high, the output is on the falling edge of CLK considered the 'Right' channel. If this pin is low, the output is on the rising edge, a.k.a 'Left' channel.
  • CLK: PDM clock in, 1 - 3 MHz square wave required
  • DAT: PDM data out.

Resources

Shipping List

  • 1 X Adafruit PDM Mic Module - Qwiic
  • 1 X Qwiic Cable - 100mm
  • 1 X JST-SH Du Pont male 4 Pin Cable


Adafruit PDM Mic Module - Qwiic

  • Brand: Adafruit
  • Product Code: AF4346
  • Stock

    Warehouse Stock Status Location
    Centurion In Stock UL063
    Stellenbosch In Stock V7
  • R138.00 (Inc Tax: R158.70)


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Tags: adafruit, pdm, mic, microphone, audio, sound, qwiic