INA128: What instrumentation amplifier would you recommend for the amplification phase of an EEG?

Hi Pablo, 

Pablo Lopez said:

In the datasheets the specifications are quite similar but I would like to know if any of them works better for EEG applications.

INA333, INA118, INA128 or INA821 works well for ECG/EKG/EEG applications. It depends on your design requirements. 

If the application is battery driven or portable, then INA333 and INA118 may be more suitable.  INA333 is ultra low power IA. 

If dual power supply rails are used and power consumption is not a constraint, I would recommend INA821, INA818.

https://www.ti.com/about-ti/newsroom/news-releases/2012/2012-09-10-ti-eeg-analog-front-end-lowers-noise-more-than-75-percent-for-non-invasive-brain-wave-monitoring.html?keyMatch=eeg&tisearch=universal_search

https://www.ti.com/solution/electrocardiogram-ecg

Here are the performance parameters that you would need to keep track of per EEG application. 

a. Input impedance or Ib

b. Noise

c. CMRR (reject 50/60Hz noise)

d. Vos and drift

e. PSRR

f. Gains

g. Input protection. 

If you have other questions, please let us know. 

Best,

Raymond