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ADS1299 - Pin and Jumper configurations for single-ended EEG inputs with Bias and Reference electrodes

Greg Jackson1
Prodigy 220 points
Other Parts Discussed in Thread: ADS1299

Can somebody comment on this particular setup?  I am getting some results, but I am not sure if they are optimal.

I have single-ended inputs connected to the +pins of CH1 and CH2.  I have jumpers on the -pins of CH1(33-34) and CH2(29-30) to the left side (J6).  

I have jumpers on 3-4 and 5-6 of JP25 to connect BIAS_ELEC to all INMs and to short BIAS_ELEC to REF_ELEC which connects to SRB1.  I have closed SRB1 in the software.

I have jumpers on 1-2 of JP6, JP7, JP8, as the factory defaults suggest.

I have the bias electrode connected to pin 2 of JP25.  I do not have the reference electrode connected, though I did try it on pin 3 of JP8, though I'm not clear if it actually changed anything.

Is this a good way to set this up?  I am using a 64-channel headset with single-ended electrodes, but for the sake of simplicity, I am only actually using 2 channels plus reference and bias (ground).

Please comment on whether this makes sense, whether other settings need to be adjusted, or whether the pins / jumpers being used are wrong.

Thanks. I am including a picture of the setup.

  • 0
    TI__Guru**** 174226 points

    Hi Greg,

    It looks like the 'black' leads in your picture are floating, can you tell us what they connect to in your cable?  Is that perhaps the cable shield?

  • 0 in reply to Tom Hendrick
    Prodigy 220 points

    The black leads are floating at both ends, they are disconnected.  They have no impact on the setup. Those are just the cables we happen to be using, when we move past the development board (we'd like to use the chip in a wireless setup) we won't be using them, so I've just treated them as single-ended cables.  The white end of the cable is connected to the development board and to a board that connects to our headset, the black end is left open at both ends.  Alternately, we could connect the black end and leave the white end open.

    Does the rest of it make sense, ignoring those?

  • 0 in reply to Greg Jackson1
    Prodigy 220 points

    I really just want to be clear on the Bias and Reference electrode connections, as the headset has dedicated Bias and Reference electrodes.

    My assumption is that I should put a jumper on JP25 pins 3-4 to connect BIAS_ELEC to INMs and 5-6 to connect BIAS_ELEC to REF_ELEC (as suggested for single-ended electrode configurations)

    Then I have connected the Bias electrode to pin 2 of JP25, so that it connects to the negative pins of J6.

    Then I have jumpers across the negative pins of the channels in J6 (i.e. 33-34, 29-30, etc)

    I'm not sure where to be connecting the reference electrode? Is it to one of the pins in JP6, JP7, or JP8?

  • 0 in reply to Greg Jackson1
    Prodigy 220 points

    Hi, I'm wondering if there was any new information available about this?

  • 0 in reply to Greg Jackson1
    Intellectual 840 points

    What instrument measurement for the NOISE MEASUREMENTS(SNR _the ads12999 datasheet page 6  NOISE MEASUREMENTS) to ADS1299??

  • 0 in reply to Yan Jia-hong
    Prodigy 50 points

    hey do i have to use special scalp electrodes for ads 1299 or i can interface normal scalp electrodes to ads 1299 fe 

  • 0 in reply to Greg Jackson1
    Intellectual 480 points

    Hello Greg,

    did you get an answer of your question, because i am also confused with the description about where to connect the reference an ground electrode onto the board.

    Regards

    Melanie

  • 0
    Prodigy 125 points
    Hi guys,
    I also have this problem.
    Can any successful teach me, please!
    I hope my EEG instrument can detect my brain channels.
    I can make sure every beginner have the same problem, please help the old you, if you have succeeded this challenge.
    Thank you!

    Sincerely,
    Kindle