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Original question:

ADS1299：About the noise problem of ADS1299

ADS1299 gain not updating.

Rommel Chiñas
Prodigy 10 points
Other Parts Discussed in Thread: ADS1299

I am using the ADS1299 evaluation board to record EEG data and display it on Labview. We are using a gain of x24 and the Byte output for every electrode is 8388608. 

This value does not change when I reduce the gain to any other value.

I am changing the PGA gain using the CH[1:8]SET control register.  If you need extra details please let me know.

Thank you,

Rommel.

  • 0
    TI__Genius 11550 points

    Hi Rommel,

    Welcome to the E2E forum !!! 

    It looks like your input is causing the ADC output to saturate at the negative full-scale (ADC output code of 0x800000). Please make sure you are setting the correct common-mode voltage bias to the the device input channels? Please refer to sections 9.3.1.2 and 9.3.1.3.1 in the datasheet for more information on the analog input requirements.

    Thanks,

    -TC