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ADS7952-Q1: VA drops lower than Vref

Shinji Tsuji
Genius 14139 points
Part Number: ADS7952-Q1

Hi team,

I plant to use ADS7952-Q1 with VA=5V, Vref=5.0V (2.5V x2 mode)

If VA drops below Vref voltage like 4.8V,

1. Is there any reliability issue?

2. What is the output code at this condition? Will it overflow?

regards,

  • 0
    TI__Mastermind 25020 points

    Hello,

    Since this is using an external reference that is actually at 2.5V and not 5V, this will not be an issue.

    The input is scaled down by half to be able to use the x2 range, the AVDD does not directly affect the measurement of the output.

    That being said, be sure that all voltages to the device, AVDD and REF are within the specified ranges given in the datasheet, if these are violated, then the device can show unexpected behavior.

    the AVDD lower than then reference might not cause immediate alarm, if there unexpected dips, but it should not be a normal operating condition.

    Regards

    Cynthia