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ADS131A04 - Multiple Device Synchronous Sampling

Aaron Lancour
Prodigy 30 points

I have a quick question regarding the CLKIN of the ADS131A. For our application, we have 3 devices that are using the Multiple Device Configuration Using Asynchronous Interrupt Mode shown in Figure 99 of the Sept 2016 datasheet.

If CLKIN is source synchronous, are the samples from all 12 channels spanning the three devices also guaranteed to be synchronous or in other words are they all sampled at exactly the same instant in time? 

Thank you,

Aaron

  • 0
    TI__Mastermind 38745 points
    Hey Aaron,

    They key to synchronizing the conversions besides the clock, is the DRDY pin of all the devices. Note that the first device is in Asynchronous Interrupt Mode so its DRDY pin is an output indicating when a conversion is ready. The devices down the chain are in Synchronous Slave Mode. Their DRDY pins are inputs that will check to ensure their conversions are synchronized. If they are not (for instance, right at power up), the digital filter will reset in order to synchronize to the DRDY input.

    Regards,
    Brian