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ADS1260: Internal/External Reference configuration

Kuramochi Tadahiko
Guru 28715 points
Part Number: ADS1260
Other Parts Discussed in Thread: REF6025

Hi,

We concern the difference between the internal reference configuration and the external reference configuration.

For instance, we are afraid of the longer settling time by external reference configuration.

If there is a reference voltage which is the same characteristic as the internal reference and it is connected as the external reference, its characteristic is the same as the internal reference.

Is my understanding correct?

Best Regards,

Kuramochi

  • 0
    TI__Mastermind 35540 points

    Hi Kuramochi,

    The reference's characteristic depends on its design. The followings show the setting time of internal voltage reference on the ADS1260 and the settling time of external voltage reference REF6025 which has a higher BW buffer on the output for higher precise to the first sample of ADC, both of them have 100ms settling time, however the same time means the settling to ±0.001% of final value on the ADS1260, the settling to 0.1% of final value on the REF6025 and it will take longer time to settle to higher accuracy. Note that REF6025 has lower drift performance.

    I hope this helps you.

    Internal voltage reference on ADS1260:

    External voltage reference REF6025: 

    Best regards,

    Dale

  • 0 in reply to Dale Li
    Guru 28715 points

    Dale-san,

    Thank you for your help.

    I know that the characteristics are different by the performance of reference as above mention.

    I would like to know if there is a difference by the "configure".

    Best Regards,

    Kuramochi

  • 0 in reply to Kuramochi Tadahiko
    TI__Mastermind 35540 points

    Kuramochi-san,

    I do not see a difference on the configuration. The internal or external voltage reference can be selected in the same REF register through same internal multiplexer then internal reference buffer. 

    Regards,

    Dale