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ADS1262: ADS1262 sync options

Idan Ozana
Intellectual 480 points
Part Number: ADS1262

Hi,

In my application I need to prevent from several independent ADS1262 ADCs to drift over time. One way to do that is to stop all conventions every period of time, reset the ADC (to my understanding: to reset the previous data in the filter, not power down!), wait for external sync discrete and start them all at the same time.  Am I correct with those assumptions?

Another way that thought about is to stop the ADC external crystal oscillator (allied there phase...). What will happened to the ADC in this condition? To the previously data in the filter, serial interface and so on....

Thanks a lot,

Idan

  • 0
    TI__Mastermind 44680 points
    Hi Idan,

    I don't think you need to "RESET" the ADCs to re-sychronize them...It should be sufficient to issue a "START1" command (or toggle the START pin) to all devices so that all ADCs begin a new conversion at about the same time.

    ...While you could "RESET" all of the devices, you would likely need to re-program the ADC's device registers. During WREG commands to certain register addresses you will inadvertently be restarting ADC conversions and would need to issue a synchronous "START1" command anyways, unless you can synchronously issue WREG commands to all devices.

    Stopping the ADC's clock pauses its internal operations. Generally there isn't any harm in stopping the clock; however, during this time the device will not be responsive.

    Best regards,
    Chris
  • 0 in reply to Christopher Hall
    Intellectual 480 points
    Hi,
    So basically what you are saying is that when I'll toggle the start pin I will erase all the filter previously data and instantly start new conversion, right? If yes, That is great and three is no need to reset the ADC....
    Thanks a lot,
    Idan
  • 0 in reply to Idan Ozana
    TI__Mastermind 44680 points

    Hi Idan,

    Correct! Toggling START (or issuing the START1) command will erase/reset the digital filter.

    ...When using the SINC2/3/4 filter, you'll notice that the next conversion result will be delayed by about 2/3/4 conversion results as the filter needs to collect additional data in order to settle.

    Best regards,
    Chris