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Original question:

ADS1299 SRB1 and SRB2 functionality in multiple devices

ADS1299: SRB1 and SRB2 in standard configuration

RAJASREE RAJASEKHARAN
Prodigy 56 points
Part Number: ADS1299


Tool/software:

We intend to use two ADS1299 ICs for ECG and EEG. How can we connect the two devices' SRB1 and SRB2?because we intended to utilize SRB2 as a reference and short all negative pins internally. Is it OK, or do we need to make any changes?

  • 0
    TI__Guru 67206 points

    Hello Raja,

    Thank you for your post.

    SRB1 and SRB2 can be shorted together for multiple ADS1299 devices. One common reference signal can be routed into all negative inputs by connecting it to both devices' SRB1 pin. Likewise, SRB2 pins can be shared if the reference electrode is to be chosen from either device. Otherwise, if the reference electrode will always come from Device 1, it is not necessary to connect the SRB2 pin of Device 2. 

    Regards,

    Ryan