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ADS1260: Reference configuration for ADS1260

Johan Hedlund
Prodigy 10 points
Part Number: ADS1260

In reading the data sheet for the ADS1260 regarding reference configuration:

Program the RMUXP[1:0] and RMUXN[1:0] bits of the REF register to select the positive and negative reference
voltages, respectively. The positive reference selections are internal positive, AIN0, AIN2, or AVDD. The negative
reference input selections are internal negative, AIN1, AIN3, or AVSS.

In each of the headline it seems like you can select either Internal reference, External Reference or AVDD-AVSS.

But in the figure 53 it seems like you can select freely which is Vrefp and Vrefn.

My question is it possible to use AIN0 as Vrefp and AVSS as Vrefn? My input is AIN1-AIN2 and AIN3-AIN4

  • +1
    TI__Mastermind 43701 points

    Hi Johan Hedlund,

    The recommended operation would be to use the input pairs described in the datasheet for the external reference. This is the intended behavior, and the actual routing on the ADC die reflects this intent.

    However, it is possible to choose different combinations e.g. AIN0 and AVSS. I tested this on the EVM and I got the same result when using the internal VREF as I did using a biased resistor between AIN0 and AVSS.

    -Bryan