Diffrent AFE4400 and AFE4403

Inho Jeon

Other Parts Discussed in Thread: AFE4403, AFE4400, AFE4403EVM, AFE4404

I have EVM Bd of AFE4400 and AFE4403.

Connect directly DCM03(PPG Sensor by AMPkorea)to EVM Bd AFE4400 and AFE4403.

In config set default, It is different waveform using EVM GUI ADC capture & Analysis.

EVM AFE4403 waveform is fluctuation amplitude like sawtooth wave but EVM AFE4400 waveform is not just dc wave like saturated wave.

Is it not proper PPG sensor for AFE4400?

And then, Inform me PPG sensor for AFE4400.

Or, inform me setting EVM GUI config. AFE4400.

over 9 years ago

0 Amy Schnoor over 9 years ago

TI__Mastermind 18285 points

Inho,

We have received your post and hope to have a response back to you soon.

0 Amy Schnoor over 9 years ago in reply to Amy Schnoor

TI__Mastermind 18285 points

Inho,

Can you send me a screenshot of the PPG waveform?

0 Inho Jeon over 9 years ago in reply to Amy Schnoor

Expert 1452 points

Hi, Amy!

I attached files that is you wanted.

Thank you.

Best Reagards

Inho Jeon.

0 Amy Schnoor over 9 years ago in reply to Inho Jeon

TI__Mastermind 18285 points

Inho,

Your AFE4400 is definitely saturating. Every subject is different, so I cannot give you a guaranteed setting that will work, but I would suggest you reduce the current setting first until you are not saturating, then adjust your gain settings as needed.

0 Inho Jeon over 9 years ago in reply to Amy Schnoor

Expert 1452 points

Hi Amy,

Thank you for your reply.

And, I have a question about attached a screenshot "AFE4403EVM GUI".(Refer to my reply on Aug 21, 2015 6:33 AM)

As you see, that waveform is good but it is contain low frequency noise.

How to reject that noise?

Please, give a tip.

And I attached a circuit file about I designed. For your comments.

Best Regards,

Inho Jeon.

0 Amy Schnoor over 9 years ago in reply to Inho Jeon

TI__Mastermind 18285 points

Inho,

This noise sometimes happens when ran off AC power. If you are running off of a laptop you can try to remove the power cable and run off of the battery only.

You can also try to put black tape around the sensor like Figure 6 in the AFE4404 User's Guide. www.ti.com/.../slau621.pdf

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Diffrent AFE4400 and AFE4403