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AD5522- What mean constants 4.5 and 3.5 in transfer function?

Category: Datasheet/Specs
Product Number: ad5522

hi.
I am currently building a board utilizing AD5522.
However, I am completely new to DAC.
I'm reviewing the datasheet, and the numbers 3.5 and 4.5 keep bugging me.
What do these two numbers mean? And I would like to know how this number was created.

Also, what additional materials should I study to better understand this DAC?

thank you

Thread Notes

Top Replies

    •  Analog Employees 
    Feb 15, 2024 +1 verified

    Hi  ,

    The 3.5 and 4.5 gain setting you are seeing in transfer functions are simply the result of gain configuration of offset DAC and FIN DAC outputs.

    The DAC amplifier gains VREF by 4.5 which gives…

  • Hi  ,

    The 3.5 and 4.5 gain setting you are seeing in transfer functions are simply the result of gain configuration of offset DAC and FIN DAC outputs.

    The DAC amplifier gains VREF by 4.5 which gives a DAC output span of 22.5 V (as stated in the AD5522 Datasheet), the offset DAC centers that range about some chosen point. In the case of AD5522, the range is centered at 0V by default (offset DAC code =0xA492). You can read more about it in the AD5522 datasheet.



    Hope this helps. You can reach out anytime if you have additional questions.

    Regards,

    Menchie