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Yummy AD/DA Cookie

Tiny audio PCBs

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Audio Cookies are tiny SMD audio circuits which can easily be used in bigger projects. The PCBs are designed in a castellated-holes-style, which somehow reminds me on cookies.

I decided to split my ESP32 Guitar Shield project into smaller modules, which can be reused in other projects. This is the AD/DA part

AD/DA Cookie

This square-inch-sized PCB is a high quality audio codec board featuring an AKM AK4556 i.e. an analog to digital and digital to analog converter. 

  • I2S Interface (configurable)
  • Configuration is easily done with four pins, no complicated I2C interface 
  • 24 Bit, up to 216kHz 
  • Dynamic Range / Noise floor
    • ADC 103 dB
    • DAC 106 dB
  • Signal to Noise Ratio / THD+N
    • ADC 91 dB
    • DAC 90 dB

  • PCBs arrived

    Gary05/06/2019 at 08:05 0 comments

    Hooray, the OSHPark PCBs arrived. Took some weeks to Germany with free shipping. They are perfectly purple, solder mask and silk screen are looking really good. Knowing that OSHPark does not officially support castellated holes, at least one side is looking ok. The other side is not through-hole plated at all, although the design is fully symmetrical. Nevertheless, should be ok for a prototype (solder blobs to the rescue!)

  • Prototype PCB

    Gary04/14/2019 at 10:18 0 comments

    I decided to give OSHPark a try although they don't officially support castellated holes. So for now I'm waiting for the prototype PCB...

  • Gerber

    Gary04/10/2019 at 21:41 0 comments

    Today I found the time to finish the design and export the Gerbers in KiCad. 

    Learnings:

    • Gerber export is done via File->Plot in PCBnew
    • Solder mask min width had to be set to 0.099 mm to allow 0.1 mm solder mask bridges between the codec pads (found in Setup->Pads to Mask Clearance)
    • Looks like castellated holes leads to extra charge due to special milling bits 

  • PCB layout

    Gary04/03/2019 at 21:47 0 comments

    Schematics and layout are done and yay it fits into 1 square inch! Gerber stuff and production files are next.

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Richard Hogben wrote 04/04/2019 at 15:23 point

Cool!

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