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ADS1261: Long-term reliability powering on/off

Ambroise Suter
Expert 3820 points
Part Number: ADS1261

Hello,

The reduce power usage we want to on/off our ADC all 5s. We would enable power to the ADC, take a few samples, and then disable power for 5 seconds. Would this approach raise some long-term reliability concerns for you?

How long is the startup time of the ADC if power is completely off? 
What would be the current needs in Hardware/Software Power-Down?

Thank you and best regards,

Ambroise

  • +1
    TI__Mastermind 35081 points

    Hi Ambroise,

    We do not test the long-term reliability of the ADS1261 as it relates to power cycling, so I don't have any data to share that definitively determines how much this impacts the device. However, we have many other engineers power cycling their ADCs / systems and have not heard any feedback from them that this action degrades the long-term performance of the device. Nor is there any real physical reason why that should be the case.

    The startup time is shown in Figure 5 in the datasheet. Once the supplies have ramped, there are two lengths of time to consider: the power-on threshold voltage to ADC communication (tPRCM), and ADC communication to conversion start (tCMCN). These times are listed in Section 7.7 in the datasheet as 2^16 (typ) and 512 (min) 1/fCLKs respectively, where fCLK is the frequency of the clock signal provided to the ADC (not to be confused with the serial clock, SCLK). The ADS1261 has an internal oscillator that supports fCLK = 7.3728 MHz.

    The ADS1261 consumes 0.1 mW (typ) / 0.2 mW (max) in power down mode per the datasheet.

    -Bryan