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ADS1284: ADS1284 DC offset

bao huang
Prodigy 160 points
Part Number: ADS1284

We are using ADS1284 for data recording, each time i turn it on, the DC offset is randomly either -40uV or 77000uV, could you please help what's the problem, thanks.

  • 0
    TI__Mastermind 44620 points

    Hi ,

    Welcome to the TI E2E Forums!

    It seems as if the internal dc offset is either enabled or disabled after you initialize the device (see https://www.ti.com/lit/ds/symlink/ads1284.pdf#page=49).

    Are you writing to the device registers after power up? Also, how are you powering the device on and off?

    There might be an brown-out condition occurring if power is disabled and re-enabled too quickly. Any decoupling capacitors on the analog and digital supplies will hold charge momentarily after power is removed. When powering down the system you might want to delay these supplies to ensure that these capacitors have had time to discharge. If that is not something you have control over, then perhaps you could hold /PWDN low for a time to keep the device in power down while the supplies settle. Also, you might try issuing a RESET command after powering on the device to ensure register values are set to their default settings.

    Let me know if that helps!

    Best regards,
    Chris