This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS1262: ch-to-ch offset variation and ch-to-ch offset drift variation

Genius 17335 points
Part Number: ADS1262
Other Parts Discussed in Thread: ADS124S08,

Hello,

I posted a question about ch-to-ch offset variation and offset drift varation for ADS124S08 before.
And I got the answer that these should be very small and we can ignore them.

https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/937166/ads124s08-ch-to-ch-offset-variation-and-ch-to-ch-offset-drift-variation/

I received the same question for ADS1262. 
In ADS1262 case, is the answer the same?

Regards,
Oba

  • Hi Oba-san,

    The answer Bob gives about the ADS124S08 ch-ch offset variation is generally applicable to the ADS1262 as well. Like the ADS124S08, the ADS1262 has chopper stabilized inputs. To remove any offset effect of the ADC you could use the global chop mode which will remove ADC offset by taking two measurements with one measurement swapping the inputs and then averaging the two values together.

    Also like the ADS124S08, there may be device to device variation and lot to lot variation, but within a single-device the construction is the same for each input channel.  Offset will be determined by the PGA and ADC itself and not the input connections.

    -Bryan

  • Hello Bryan,

    Thanks for your answer.
    Sorry, I missed to ask about input bias current along with offset and offset drift.
    Bob also answered the input bias current is basically the same for all channels in ADS124S08.
    Is it the same in ADS1262?

    Regards,
    Oba

  • Hi Oba-san,

    Yes, the input bias current is effectively the same for all channels on the ADS1262.

    -Bryan