ADS1299: Using ADS1299 or ADS1291 for local field potential detection

user6193453

Part Number: ADS1299
Other Parts Discussed in Thread: ADS1291

Hi,

Recently I'm working on a project about detecting local field potential which is one of the brainwave. Can ADS1299 or ADS1291 detect this kind of wave?

Thank you!

over 6 years ago

0 Alexander Smith over 6 years ago

TI__Guru 55342 points

Hi,

I'm not sure what exactly you mean by local field potential, however these devices are capable of being used in EEG systems - which also detect brainwaves. The ADS1299 is great for this application since it has extremely low input referred noise.

Using the EVM as a starting point is a great way to get started with your design and test the parts capabilities!

0 user6193453 over 6 years ago in reply to Alexander Smith

Prodigy 220 points

Thanks for your reply!

The frequency of EEG is lower than 100 Hz, but local field potential may be higher 100 Hz and lower than 300 Hz. Will the ADS1299 filter the wave at 300 Hz?

Also, the amplitude may be around 1 mV, which is larger than EEG, I'm not sure whether amplifier still work well.

0 Alexander Smith over 6 years ago in reply to user6193453

TI__Guru 55342 points

This will depend on the digital filter settings and sample speed, which is programmable. I recommend looking at the sampling speed and digital filter sections of the datasheet.

1mV will be fine, the gain of the internal PGA is adjustable as well. For additional information take a look at the BIOFAQ in my signature below!

0 user6193453 over 6 years ago in reply to Alexander Smith

Prodigy 220 points

Thanks for your help!

0 user6193453 over 6 years ago in reply to Alexander Smith

Prodigy 220 points

I have another question. Can ADS1291 detect EEG accurately?

0 Alexander Smith over 6 years ago in reply to user6193453

TI__Guru 55342 points

The ADS1299 family is better for EEG measurements as the input referred noise is lower.

It depends on the magnitude of the signals being measured and the noise added by the rest of signal chain.

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ADS1299: Using ADS1299 or ADS1291 for local field potential detection