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ads1298: ADS1298 vs ADS1299

Keivan Anbarani
Prodigy 60 points
Part Number: ADS1298
Other Parts Discussed in Thread: ADS1299, , INA332

Hello,

We'r deciding between ADS1299 and ADS1298 for building a wireless/lithium battery powered EEG system and hopping someone could help us. Here is what we understand.

ADS1299 has relative reduced noise, but requires 5V which makes it unusable with standard 3.7-4V lithium batteries? 

ADS1298 relatively noisier, but functions with standard lithium 3.7V battery? would there be a significant advantage to use a preamplification circuit with INA12x?

Any info to help us decide would be greatly appreciated! 

  • 0
    Intellectual 690 points

    Hello Kevin,
    Apart from all other considerations, ADS1299 still can work with a lithium battery by incorporating a voltage converter in your device. The drawback of this solution is that you have to take care on reducing the noise such a converter will induce into signals you are collecting...
    As to ADS1298 - its noise is a bit too high for supplying the EEG signal directly to it. You can think for including an amplifier/active electrode that has a noise level low enough to "cure" the noise "problem" of ADS1298.

    Best regards

  • 0 in reply to Kamen Ivanov
    Prodigy 60 points
    Do you have any recommendations on making the preamplier/active electrode? I found out INA332 has good instructions and capabile for the job, but in the document it says it's being discontinued and not recomended to use in new design? is there any alternative op amp that includes application circuit design?
  • 0 in reply to Keivan Anbarani
    TI__Guru 66406 points

    Hello Keivan - Thanks for your interest in our ADS1298 and ADS1299.

    I would suggest posting to the Precision Amplifiers forum to look for alternatives for the INA332. I'm sure there is something more recent they would prefer to promote for this application. Unfortunately, we do not have another reference design which uses an external amplifier in front of the ADC as many customers do not prefer this approach.

    Best Regards,