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ADS1256: About setting

Kenji Ohno1
Genius 5095 points
Part Number: ADS1256

Hi Team,

I have two questions.

・Should errors due to aging be taken into account?

　My customer wants to calibrate in the production process and apply it to the product.

・Is sending the “SYNC” command the same as setting the “SYNC/PDWN” pin to “L”?

　If only " SYNC "command is used, if it is the same, should the "SYNC / PDWN" pin

　be pulled up with a resistor?

　By the way, "Power down mode" is not used "

Best Regards,

Kenji

  • 0
    TI__Guru** 112795 points

    Hi Kenji,

    Let's start with the second question first.  The SYNC/PDWN pin is dual function.  The SYNC command is the same as the SYNC function of the pin. Generally you would pulse the pin for a SYNC.  If the SYNC/PDWN is held low for 20 or more DRDY periods, then the ADS1256 will enter power-down mode.  So if not using the SYNC/PDWN pin, then the pin should be pulled high.  Issuing the SYNC command also requires issuing the WAKEUP command.  When the SYNC command is issued, then the device is held from converting until the WAKEUP command is issued.  Information regarding SYNCHRONIZATION is on page 27 of the ADS1256 datasheet.

    As far as aging, we don't generally characterize long term aging effects other than the reference (and the ADS1256 has no internal reference to age as it requires an external reference).  We do accelerated life tests to stress the parts and age them with temperature and then verify that the device stays with specification.  So the dominant factor with respect to gain error lies outside of the ADS1256.  So aging of the reference is probably a bigger factor than the ADS1256 itself.

    Best regards,

    Bob B