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ADS124S06: calibration procedure

Part Number: ADS124S06

Dears

When using the ADS124S06, my customer have below confuse about the calibration procedure.

1.  when doing the self calibration, should the device under continue mode? if the device is in standby mode, will the self calibration command works?

2.  how customer will know the self calibration is finished and successfully? 

3. how about the system calibration procedure, and also repeat above point1 and point2 confuse.

Thanks for your help

Jun Shen

  • Hi Jason,

    See my responses to the questions below.

    Best regards,

    Bob B

    1.  when doing the self calibration, should the device under continue mode? if the device is in standby mode, will the self calibration command works? [Bob] The device does not need to be in continuous mode, but it must be converting.  If the ADS124S06 is in single-conversion mode, the START command must be issued to begin the conversions.  Before the conversion completes, the SFOCAL command must be issued.  The SFOCAL only removes the offset of the ADC by placing an internal short at the mux and the using the conversion value as the offset and places the value into the OFC registers.  The value in the OFC registers will be subtracted from each conversion thereafter to remove the offset.  The data rate and PGA settings should be set to the desired values prior to issuing the SFOCAL command.  In most applications issuing the SFOCAL command is all that is necessary.  Another method to remove offset is to use the global chop feature.

    2.  how customer will know the self calibration is finished and successfully? [Bob] The end of the calibration cycle will be indicated by the transition of DRDY the same as a normal conversion.  When DRDY transitions from high to low, the calibration has completed.

    3. how about the system calibration procedure, and also repeat above point1 and point2 confuse.[Bob] System calibration requires the input to be set to a '0' level for the system offset calibration.  For the system gain calibration the input must be set to a full-scale voltage at the input.  It may not be necessary to use the system calibration as this requires external capability to provide the proper input voltages for making the calibration.  Depending on the sensor, there may be better methods for calibration.