ADS1299-4: input impedance

Dilshan Ganepola

Part Number: ADS1299-4
Other Parts Discussed in Thread: ADS1299

We are interested capturing EEG signals using ADS1299. Its said in the datasheet the input impedance is around 1Gohms. For our specific task we need to have more higher input impedance. Could we achieve it by adding a high impedance opamp like OPA129 in voltage follower configuration for differential analog input pins.

Thank you.

over 6 years ago

0 Alexander Smith over 6 years ago

TI__Guru 55232 points

Hi Dilshan,

Thanks for your post and welcome to the forum!

There's not problem with this electrically, but one concern is that the noise of the amplifier may cause issues for the signal to noise ratio of the measurement. I'm curious, can you share why you need more than 1G of input impedance?

0 Dilshan Ganepola over 6 years ago in reply to Alexander Smith

Prodigy 40 points

Dear Alex Smith,

Could you contact me privately. /.com to share more information.

Thank you.

regards

0 Alexander Smith over 6 years ago in reply to Dilshan Ganepola

TI__Guru 55232 points

Sent.

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ADS1299-4: input impedance