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Part Number: ADS131E08EVM-PDK
a customer evaluates the ADS131E08 EVM and noticed that all raw data are even numbers.
Just some numbers as example from a full sweep (negative saturation to positive saturation):
This was noticed with all 8 channels.
How could this be explained?
Thanks and best regardsMartin
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Hi Martin, 7FFFFF is an odd number, but I'm sure your customer is more concerned that he does not see any odd codes between +/- full-scale. For any given input voltage, we should see some level of noise that causes the last few bits toggle. Is your customer only taking one sample for each input voltage? Would you mind sending me a full list of several data points for a given input voltage (i.e. at least 100 points)? Best Regards,
Precision ΔΣ ADCs
In reply to Ryan Andrews:
apologies for the late response, please find below the list of a measurement (input pins connected).
Bit 0 is always '0'.
In reply to Martin Seeger:
I still do not have an explanation for this. I have verified that, on the current version of the EVM hardware/software I'm using, I do not see this issue upon exporting the raw data to an Excel file. Can you confirm that your customer is using the same version?
ADS131E08 Evaluation Software and Firmware Version
Also, how are they exporting and saving the data? They should be using the Save tab, then selecting the channels and data format to save. "Data - Codes" will save the raw hexadecimal ADC output.
yes, the customer confirmed that they use the same software version and did the same to export the data.
Please find below some more values from the export:
A difference I saw between your export and the customer's is a status bit - is this the IN1N_FAULT?
Hi Martin, Yes - the only difference appears to be that "IN1N_FAULT" is set to '1' on my EVM. Not sure why, but that should have no effect on the channel data. I'm honestly at a loss for suggestions. Has the customer tried multiple EVMs? Best Regards,
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