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ADS1119 - Multiplexing Channels in Continuous Mode

Part Number: ADS1119

Hello,

for my application with ADS1119 I need 4 single ended analog inputs. Is it possible to aquire them with the ADS1119 in continous mode? As I understood the data sheet, the MUX have  to be switched each time by command, so that using the continous mode might not make sense. Or is there any auto-MUX possibility to use together with continous mode?

Thank you & best regards, Niko

  • Hi Niko,

    Welcome to the E2E forum!  The ADS1119 is a muxed input with a single ADC.  There is no auto mode for this device to cycle the mux.  You could use continuous mode, but it may be easier to monitor the end of the conversion and then change the mux channel and start the next conversion using single-shot mode.  Using single-shot mode is easier to keep the conversions in sync with the communication.

    The process would be as follows:

    1. Write configuration for mux channel AIN0-AVSS
    2. Start conversion 
    3. Monitor DRDY for end of conversion when DRDY transitions from high to low
    4. Read conversion results
    5. Write configuration for mux channel AIN1-AVSS
    6. Start conversion 
    7. Monitor DRDY for end of conversion when DRDY transitions from high to low
    8. Read conversion results
    9. Write configuration for mux channel AIN2-AVSS
    10. Start conversion 
    11. Monitor DRDY for end of conversion when DRDY transitions from high to low
    12. Read conversion results
    13. Write configuration for mux channel AIN3-AVSS
    14. Start conversion 
    15. Monitor DRDY for end of conversion when DRDY transitions from high to low
    16. Read conversion results
    17. Go to 1

    Best regards,

    Bob B

  • Hi Bob,

    thank you very much for your feedback.

    Best regards, Niko