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Full machine-readable index: https://core-electronics.com.au/llms.txt # Adafruit PDM MEMS Microphone Breakout **Type:** Product page · **SKU:** ADA3492 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia) **Page:** https://core-electronics.com.au/adafruit-pdm-mems-microphone-breakout.html ([markdown](https://core-electronics.com.au/adafruit-pdm-mems-microphone-breakout.html.md)) An exotic new microphone has arrived in the Adafruit shop, a PDM MEMS Microphone! PDM is the 'third' kind of microphone you can integrate with electronics, apart... ## Pricing - **Price:** $9.85 (inc GST) — $8.95 AUD, exc GST - **Quantity discounts:** 10+ $8.68 (exc GST) · 50+ $8.51 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 10 today, and up to 500 more in 8–12 days. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA3492:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/ADA3492:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description An exotic new microphone has arrived in the Adafruit shop, a **PDM MEMS Microphone**! PDM is the 'third' kind of microphone you can integrate with electronics, apart from analog or I2S. These microphones are very commonly used in products, but are rarely seen in maker projects. Still, they have some benefits so they thought we'd offer a breakout for the shop. The first thing to note is that this sensor does not provide an 'analog' output like many of Adafruit's electret microphone assemblies. So it's great for chips that do not have analog inputs. Secondly, the digital interface is a very simplistic **p**ulse **d**ensity **m**odulation 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 with be 0 or 1 logic output, with the square wave creating a *density* that when averaged will result in the analog value out. There's a few ways to manage these mics: - Your chip comes with a hardware peripheral and library that does all the data managing at high speed, collects samples, applies a filter and gives you an analog value (Ideal!) - Your chip comes with a hardware peripheral that gives you values, then it is up to you to perform the decimation/filtering. (We have some example code for this on the ATSAMD21 chipset) - Your chip does not come with a hardware peripheral but you're pretty clever and come up with a way to make it work ([See this example for the ATtiny85](https://curiouser.cheshireeng.com/2015/01/21/pdm-in-attiny85-source-code/)) - You generate the high speed clock, then add an analog filter on the data line, and read the analog value (A hack, but works!) Either way you decide to go, make sure you have a handle on what support you get with your platform, as these chips are a little tricky! Each order comes with one fully assembled and tested microphone, and a little header to solder on for breadboard-compatibility. Check out Adafruit's full guide for wiring details, schematics, example code, datasheet and more! ![https://www.youtube.com/embed/NzmqDxaMUE4?start=670](https://core-electronics.com.au/attachments/localcontent/hqdefault_18308f168f0.jpg) ## Technical Details [Wiring, schematics, example code, datasheets, Fritzing and more in the product tutorial!](https://learn.adafruit.com/adafruit-pdm-microphone-breakout/) - Voltage Range: 1.8-3.3V - Clock rate: 1 - 3.25 MHz - Current draw: 0.6mA - SNR: 61 dB - Sensitivity: ~-26 dBFS Product Dimensions: 14.0mm x 12.8mm x 2.8mm / 0.6" x 0.5" x 0.1" Product Weight: 0.5g / 0.0oz ![](https://core-electronics.com.au/attachments/localcontent/rohs_icon_8216055e11.jpg) ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/3/4/3492-00.jpg)