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ADS61B23: IC not able to take recommended supply voltage

Shubham Sahasrabudhe
Prodigy 10 points
Part Number: ADS61B23


I have been testing the ADS61B23 IC for quite some time and have encountered a persistent problem even if I change my IC or pcb. The ADC is not able to withstand recommended supply voltage of 3.3V (AVDD) and 1.8V (DRVDD) while operating in parallel CMOS mode. The IC sinks a lot of current (beyond the rated approx. 100 mA) before reaching the supply voltage. Please post your suggestions.

  • 0
    TI__Mastermind 18095 points
    Per the datasheet, the AVDD (3.3V) draws 104 mA. The DRVDD (1.8V) draws 4.5 mA in CMOS interface mode. That current draw is scales with sampling frequency and load capacitance. It appears that there is voltage drop between the power supply and the device so that the voltage is below minimums at the device. To some extent, this is normal as there will be some voltage drop across cables and the board. If this is the situation, you can simply juice-up the voltage a bit until you get the proper values at the pin of the part.

    If AVDD is really drawing significantly more that the expected 104 mA, then I do not see a mode or set-up in the device that will yield that kind of increased current. Check current/voltage when the device is powered down to ensure that there is not something else drawing excessive current.

    --RJH