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If you are using the single-shot mode you are already in the power down mode when the conversion has completed. You will not gain further power savings by issuing the POWERDOWN command while in single-shot mode. The POWERDOWN command is useful when running in continuous conversion mode and you want to stop taking conversions for a period of time. When the START command is given the ADS1120 will take a single conversion if the mode is single-shot and then power down. If the START command is given with the device configured for continuous conversions, the ADS1120 will continue to take conversions until a POWERDOWN command is issued, or the mode is changed to single-shot.
I was reminded about one other thing relative to power down. What I stated in my earlier post is true for just the process of taking conversions. When running in single-shot mode and IDACs are set to a value other than 0, the IDACs will remain powered within the idle period. The POWERDOWN command will turn off the IDACs if using the single-shot mode and the device is in the idle period. In this particular case you can conserve power by issuing the POWERDOWN command when using single-shot mode.
However, using the POWERDOWN command within single-shot mode with IDACs on becomes complicated. You will be required to wait an additional amount of time for the current sources to be established and to to settle to the proper value once the START command has been given. That is why the IDACs are not automatically turned off during single-shot mode at the end of the conversion. You will need to throw away the first result as the data will be invalid. You will need to wait until the IDACs have settled and then issue another START command to get valid results.
