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ADS1292 vs ADS1298: Why is ADS1298/1299 more suitable for EEG than ADS1292?

Ernesto Gonzales
Prodigy 225 points
Other Parts Discussed in Thread: ADS1298, ADS1299, ADS1291

What is the main difference? So far, I've only seen that ADS1298/1299 have more channels and hence a relatively large power consumption.

Is there any other crucial feature I should be aware about?

Thanks in advance for your answer

Ernesto

  • 0
    TI__Mastermind 38745 points
    Hey Ernesto,

    Channel count is really the largest advantage. Most EEG applications require a large channel count. Having 8 channels on both the ADS1298 and ADS1299 reduces the total number of ICs necessary to conduct all of the conversions. Reducing the number of components will save board space as well as microcontroller pinout.

    Regards,
    Brian Pisani
  • 0 in reply to Brian Pisani
    TI__Guru 66466 points
    Hi Ernesto,

    In addition to increased channel count, the ADS1299 offers the lowest input-referred noise performance in the ADS129x portfolio. At 250SPS and Gain = 24V/V, the ADS1299 offers less than 1uVpp of noise! This is a critical spec for low-amplitude bio-potentials like EEG. The ADS1291/92 just has too much noise for EEG applications and does not offer as much gain as the ADS1299.

    Another feature that is unique to the ADS1299 is the ability to internally route a common reference electrode input to the negative input of each channel for easy single-ended measurements. This reference signal input can be selected from one of the INxP inputs and brought out of the device at the SRB2 pin, or it can come from an independent electrode. Either way, we recommend buffering this reference signal before the SRB1 input pin, where it can be routed to all INxN inputs.

    Best Regards,