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ADS1299 BIASOUT/BIAS_DRV Pins

Anibal Laquidara
Prodigy 50 points
Other Parts Discussed in Thread: ADS1299

Dear Ryan:

I would appreciate very much to get the actual schematics of the ADS1299EEG FE Rev A, because I found differences between the Analog Evaluation Module circuit I have and the circuit at Fig 59 (pag 50) of the SLAU443-May 2012

I need to define the BIASOUT/BIAS_DRV feedback routing pins for RLD with balanced inputs.

Best Regards

Anibal

  • 0
    TI__Guru 66196 points

    Hi Anibal, 

    Thanks for checking out the ADS1299!

    What differences did you notice between the ADS1299EVM Rev A and the schematic? I do not have an updated version to provide to you, but perhaps I can verify any mistakes and make a note to correct it.

    Regards,

  • 0 in reply to Ryan Andrews
    Prodigy 50 points

    Thanks Ryan,

    I've checked the EVAL board and found a jumpers set configuration to read stomach potentials in SE and Diff modes as well, with RLD feedback.  My target is Evok Poten, and I'll choose Diff mode for it. I would like to know  which is the  purpose of the SMA AIN1 connector on the EVAL board.

    Regards  Anibal

  • 0 in reply to Anibal Laquidara
    TI__Guru 66196 points

    Anibal,

    The SMA connector AIN1 is simply another option for connecting an electrode input to the EVM. Notice that is routed to the left side of the positive J6 inputs. If you were to connect JP25 [3-4] and JP25 [1-2], you could also route this signal to the left side of the negative J6 inputs as well. Using the appropriate jumpers, you could choose to feed this signal into the ADS1299 positive channel inputs (J6 [35-36], [31-32] ...) or negative channel inputs (J6 [33-34], [29-30] ...). 

    This would be useful when you wish to measure several different electrodes with respect to a common reference electrode.

    Regards,

  • 0 in reply to Ryan Andrews
    Prodigy 50 points

    Thanks Ryan for your answer.

    I tested AIN1 driving RLD (BIASOUT), via JP1 [1-2] and JP25 [3-4] with balanced inputs. Later I will try SE inputs with AIN1 as reference (your proposed assembling) and drive BIASOUT to another  referenced input, I think.

    Regards

    Anibal