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ADS127L11: Synchronization frequency

FZ
Prodigy 40 points
Part Number: ADS127L11

Tool/software:

Hello,

I am planning an application with two ADS127L11 ADC in a daisy chain configuration and synchronous sampling.

The Appnote SBAA520 describes how the synchronization is done.
However, I can not find any information about how often it is required to synchronize or if I need to resynchronize at all.

According to the datasheet, the sampling is delayed for the filter settling time after each synchronization.
Therefore, It would therefore be desirable if a one-time synchronization was sufficient at the beginning.
Is there a risk that they will go out of sync after several years of operation?

  • +1
    TI__Mastermind 46200 points

    Hello FZ,

    Under normal operating conditions, the ADC's only need synchronized 1 time during system configuration.  However, the ADCs can become unsynchronized due to external electrical transients, or an interruption in the power supply, or a momentary reduction in the supply voltage due to some kind of brown-out event.  In these circumstances, you would need to re-synchronize the ADCs.

    One option is to use synchronized control mode.  Details on how to use this can be found in section 8.4.6.1 of the datasheet.

    Regards,
    Keith Nicholas
    Precision ADC Applications

  • 0 in reply to Keith Nicholas
    Prodigy 40 points

    Thank you for the clarification