TIDA-010029: I would like to add audio ear set capability to this PPG measurement. Need reference design or guidance.

Prodigy 20 points

Yasir Siddiqui

Replies: 3

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Part Number: TIDA-010029

Hi,

We are developing a wearable device that can be weared on ears. The functions include PPG measurements and standard audio speaker/mic hands free. Following are my questions:

1. Does TIDA-0010029 reference design works fine in the vicinity of a speaker and mic?
2. Is there a reference design combining mentioned functions? If not, could you give some guidance on design in this regard?

Thanks

• TIDA-010029

Prodigy 20 points

Yasir Siddiqui

• Sep 14, 2020 9:44 AM
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3 Replies

• Genius 11715 points

  

  Sanjay Pithadia

  

  • Sep 15, 2020 6:33 AM

  Hello Yasir,

  Thank you for your interest in TIDA-010029.

  This design has not been tested in the vicinity of a speaker and mic as the purpose was mainly to use at wrist or arm.

  Also, there is no combined reference design available. However, there is a reference schematic for stethoscope which shows interface to speaker circuit (www.tij.co.jp/.../sprab38a.pdf )

  The microphone will need a preamp and matching circuit depending on the type. Here is an example schematic for interfacing microphone (https://www.ti.com/lit/df/tidrye7/tidrye7.pdf )

  I would happy to review your schematic once you have it in place. Thank you.

  Regards,

  Sanjay R. Pithadia

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• Prodigy 20 points

  

  Yasir Siddiqui

  

  • Sep 20, 2020 7:46 PM

  In reply to Sanjay Pithadia:

  Hi Sanjay,

  Thanks for responding to my query and recommendations.

  As a first step I was wondering if CC3200AUDBOOST can be used to evaluate the combined functionality.

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• Genius 11715 points

  

  Sanjay Pithadia

  

  • Sep 21, 2020 5:59 AM

  In reply to Yasir Siddiqui:

  Hi Yasir,

  It depends on how many resources you need.

  Depending on op-amps, and other components, you will have to check the availability in CC3200. I would recommend to start with a discrete implementation prototype design and then move towards integrated components.

  Regards,

  Sanjay R. Pithadia

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