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ADS1218: Infrequent wild data outputs are received from the ADC(ADS1218) while continuous acquisition is carried out

haresh singh
Prodigy 80 points
Part Number: ADS1218

We have been using the ADS 1218 for for several years for pressure and temperature sensor data acquisition and produced few hundreds of card(with 48 ADC on board) working flawlessly with same circuit on board.

Recently we encountered a peculiar problem with data output of the one of the  ADS1218, where we configured the ADC for a particular setting of gain ,data rate and system offset and gain calibrated . when thousands of samples are continuously acquired two or three data samples are 0x000000 or 0xffffff or in between value also.

We have no reason to suspect the  circuit because when device was replaced with new one(with same setting) there was no issue at all, but removed device when tested separately showed the same problem by our device test engineers.

Can we categorize it as a  random device failure or not? If not what you suggest us to do.

I will appreciate a early reply.

Thanks and regards

Haresh

  • 0
    TI__Guru** 113765 points

    Hi Haresh,

    This sounds like a random failure.  Was this a field failure?  Or a failure in your normal test flow?

    We can possibly narrow down the issue.  How are you reading the data?  Are you using the RDATAC mode reading directly from the device or are you using the RDATA command?  How are you determining when the results are to be read?  Are you using the DRDY or are you using a time based method?

    It may be possible that the data rate is not what you think.  I would verify with an oscilloscope that the part is signalling with DRDY transitioning from high to low and at the data rate programmed to the device.

    Best regards,

    Bob B