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ADS1292: ADS1292 power-down current - Need Clarification

Part Number: ADS1292
Other Parts Discussed in Thread: ADS1293

Hello,
We are working with ADS1292 and want to know the current consumed by the chip in power-down mode.
We measured the current with power-down pin of ADS1292 pulled low (the pin was pulled low for a long time ~ more than 10 sec).
We find that ADS1292 consumes 100uA.
Note that we connect analog and digital VDD to 3V and analog and digital VSS to 0V.


From the datasheet, however, we note that the power-down current is 4uW, which translates to around 1uA for a VDD of 3V.
Can you confirm if the power-down current consumed by the entire ADS1292 chip is 1uA? If yes, why we are observing around 100uA? Is the power-down of the chip requires any additional register configurations other than just pulling down the power-down pin as we have done.

PS: We find from the datasheet of ADS1293 that the current consumed in power-down mode is 80uA. We were wondering if this is the case for ADS1292 also?

  • Hi Meghna,

    The typical power-down consumption should be 4uW or ~1.2uA for AVDD = 3V, and DVDD = 3.3V. There is no other register configuration requirement to power down the device other than pulling the PWDNB/RESETB pin low for more than 29 fMOD clock cycles.

    The design for the ADS1293 is different compared to ADS1292, so their respective current consumption in power-down mode is different.

    I will close this post as it is the same inquiry as the previous thread. Please use the original post for further discussion.

    Thanks

    -TC