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ADS1299: How to use ADS1299 in differential mode for EMG signals?

rahul vallivel
Prodigy 20 points
Part Number: ADS1299

I am working on a project which requires EMG signals. In differential mode 

  • Where should the BIAS and REFERENCE electrodes be connected?
  • Can we connect the BIAS and REFERENCE internally?
  • what should be the jumper settings for the differential mode?
  • 0
    TI__Mastermind 38745 points

    Hello Rahul,

    If you are using the ADS1299EEGFE-PDK, I am required to tell you that the EVM is for evaluation purposes only and cannot be used for an end-application or on live patients. If you want to measure EMG using the ADS1299, you should design and build your own PCB tailored to your application needs.

    Let me explain the purpose of each of the electrodes so perhaps you could understand what will be required for your application. The bias electrode is the patient drive electrode. This is similar to a Right Leg electrode in ECG. It biases the patient's voltage to within the measurement range of the ADC. Without it, the patient would be "floating" with respect to the ADS1299's analog supply voltages.

    The reference electrode is a measurement electrode. In systems where you want to measure each electrode with respect to a single electrode, the reference electrode is the negative channel input to each channel. Note Figure 18 in the ADS1299 datasheet. You can see that SRB1 can connect to every negative channel inputs. The reference electrode would connect to the SRB1 pin in the scenario where you would like to use a reference electrode.

    Brian