San Jose Tek

Designing a PCB prototype with AK5704 is not so difficult and I show an example with my design.

People who are not familiar with AK5704, please read my previous post.

I listed some useful information here just in case you want to skip my previous post 🙂

Let me share the picture of the board that I designed.

For this design, I wanted to have both analog and digital input path, so I added 3.5mm audio jacks (J1-J4) and small connectors (J6-J9).

Power supply is 3V or 5V so that I can use Raspberry Pi or Arduino.

Here is the quick features with this board.

It is currently debugging and not 100% sure everything works.

If you are interested in the schematic, please contact me and I might consider sharing the schematic if I feel comfortable 🙂

Notes:

As of 4/11/2020, analog input is working and I was able to stream the audio using Raspberry Pi ❕❕❕

AK5704 is an audio ADC with microphone amplifier. It has 4 channel and 32 bit resolution.

You can get the information including the datasheet from AKM website.

I listed some useful information here.

According to this article, they built a smart speaker demo using AK5704 and the demo was displayed during the CES 2018.

News release date in the above link is stated as 2019/06/11, so I guess it officially became available nearly 1.5 years after the CES demo in 2018.

Application using AK5704 includes:

Parts are available from Digikey although the evaluation board is not available.

The chip price is $2.36/pcs (as of 4/11/2020), so it is quite reasonable for the people who want to prototype.

Notes:
QFN package with 28 pins so it is possible to hand solder the chip for the people who want to save the money 🙂

However, the exposed pad is a concern as it should be connected to the ground.

Maybe you can solder the pad easily by PCB design considering more grounding traces to the exposed pad. I don't know....

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