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Adafruit Silicon MEMS Microphone Breakout
- SPW2430
PRODUCT ID: 2716
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DESCRIPTION
-
Listen to this good news - we now have a breakout board for a super tiny MEMS
microphone. Just like 'classic' electret microphones, MEMS mics can detect sound
and convert it to voltage, but they don't need a bias resistor or amplifier, its all in
one! The SPW2430 is a small, low cost MEMS mic with a range of 100Hz - 10KHz,
good for just about all general audio recording/detection.
This breakout is best used for projects such as voice changers, audio
recording/sampling, and audio-reactive projects that use FFT. To keep the
breakout small and simple, we only added a 3V voltage regulator (the microphone
requires 3.3V DC) and filter capacitors. No additional opamp is included, the output
peak-to-peak voltage has a 0.67V DC bias and about 100mVpp (peak-to-peak)
when talking near the microphone, which is good for attaching to something that
expects 'line level' input without clipping. The peak-to-peak can be as high as
1Vpp if there's a very loud sound. If you are If you need a microphone with
adjustable gain or auto-gain control, check out our mic+amplifier options. If you
need a higher peak-to-peak, a rail-to-rail op-amp and some resistors can get you
boosted up!
Using it is simple: connect GND to ground, Vin to 3.3-5VDC. For the best
performance, use the "quietest" supply available (on an Arduino, this would be the
3.3V supply). The audio waveform will come out of the DC pin. The output will have
a DC bias of 0.67V so when its perfectly quiet that's what you'll read, there's a little
drift. If the audio equipment you're using requires AC coupled audio, you can grab
the signal out of the AC pin, which has a 10uF capacitor in series.
The output pin is not designed to drive speakers or anything but the smallest inear headphones - you'll need an audio amplifier (such as our 3.7W stereo amp) if
you want to connect the amp directly to speakers. If you're connecting to a
microcontroller pin, you don't need an amplifier or decoupling capacitor - connect
the DC pin directly to the microcontroller ADC pin.
https://www.adafruit.com/product/2716
9/30/2015
Technical Details
Weight: 0.9g
Product Dimensions: 15.8mm x 14.1mm x 2.9mm / 0.6" x 0.6" x 0.1"
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