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Regarding PMU AD5522

Category: Datasheet/Specs
Product Number: AD5522

Please tell me the following two points about PMU AD5522.

Q1: This is a current force DAC, but will the GAIN/OFFSET calibration correction value be affected by the AVDD/AVSS voltage?
*I am considering using AVDD +12V/AVSS -12V ⇔ AVDD +23V/AVSS -1V

Q2: DACs other than current clamps (FIN, COMP) have setting registers for each current range. However, the built-in DAC does not have a current clamp setting register for each current range.If you can tell me the reason for this, please let me know.

Top Replies

  • Hi,

    This is to inform you that we have received your inquiry. We'll look into this and get back to you.

    Regards, 

    Menchie

  • Hi  ,

    Q1: This is a current force DAC, but will the GAIN/OFFSET calibration correction value be affected by the AVDD/AVSS voltage?
    *I am considering using AVDD +12V/AVSS -12V ⇔ AVDD +23V/AVSS -1V

    A1: Let me first address with regards to the supply you are considering, using AVSS of -1V will violate the specs since the value of AVSS you can use is less than or equal to -5V. Kindly see the specs from the datasheet below for your reference.

    The AVDD/AVSS supply voltage does not affect the gain/offset settings in FI mode as long as you are within the supported voltage supply specification.

    Q2: DACs other than current clamps (FIN, COMP) have setting registers for each current range. However, the built-in DAC does not have a current clamp setting register for each current range.If you can tell me the reason for this, please let me know.

    A2: For your second question, AD5522 has specific Rsense for each current range which means that changing from one current range to another current range changes the path with their respective Rsense. Each time current is forced with respect to current range used in FI mode changes the FIN M,C & X1 registers. The reason why the current or voltage clamp register setting doesn't have M, C & X1 registers per current range (as compared to the FIN, COMP) is that the clamp register limits the CLL clamp and CLH clamp based on the FSC (Full Scale Current) of specific current range so it doesn't need M,C & X1 registers per current range.

    Let us know if you have any questions.

    Regards,

    Menchie