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Accessories to be used with ADS 1299 EEG-FE kit to make a complete Biomedical Sensing device.

Ghina Zia
Prodigy 10 points
Other Parts Discussed in Thread: ADS1299
Hi,
I want to detect and process the epileptic seizures from EEG signals. For my application(early detection of seizure in Epileptic Patient), till now we have selected Open BCI which has ADS 1299 in it. 
My problem is that Open BCI is in manufacturing and it may take upto 5-6 months for it to be available. So we are trying to make our own Biomedical Sensor using ADS 1299 EEG-FE. I have the following queries:
1. What are the compatible electrodes to be used with ADS 1299
2. What are the possibilities of cascading several kits to have more than 8 channels.
3. Please Identify what other circuitry is required to develop a complete bio-medical sensor out of this kit.
  • 0
    TI__Mastermind 38745 points
    Hi Ghina,

    I'm glad you have decided to use the ADS1299! First I must give you a short disclaimer about using the EVM board, but then I can answer your questions one by one about using the ADS1299 device in general.

    I'm required to tell you that the ADS1299EEG-FE is intended for electrical evaluation of the features of the ADS1299 in a laboratory, simulation, or development environment, that the ADS1299EEG-FE is not intended for direct interface with a patient, patient diagnostics, or with a defibrillator, and that the ADS1299EEG-FE is intended for development purposes only and is not intended to be used as all or part of an end equipment application.

    As for your questions, this is what I can tell you about using the ADS1299 as an analog front end for EEG measurements.

    1. There are no electrodes that we have deemed "compatible" or "incompatible" with the ADS1299. At its core, the device is simply a analog to digital converter. As long as the electrodes you chose can reasonably protect the signal input from parasitics on its way from the patient to the converter, then it is an acceptable electrode to use.
    2. Devices can certainly be cascaded in daisy-chain mode. I'd advise reading the "Daisy-Chain Mode" section of the datasheet on page 33. While I believe it would be possible to daisy-chain multiple EVM boards since the DAISY-IN pin is broken out to a header, the firmware would have to be adapted significantly.
    3. The EVM board is not intended to be used as a bio-medical sensor, it is only to be used for evaluation of the IC that may be used in your end application circuit. I would recommend using the EVM schematic as a guide when building your own board.

    Regards,
    Brian Pisani