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PGA849: Using PGA849 with asymetric bipolar supply

Roman Abrahamson
Prodigy 10 points

Part Number: PGA849
Other Parts Discussed in Thread: PGA854, PGA848, PGA855

Hello, 

I am designing a miniature cost optimized DAQ system using the PGA849 as part of its analog front-end. Given the PGA849 is limited to a 36V recommended operating common mode supply voltage, I was wondering if it would be possible to run the PGA849 from a +28V / -8V input side supply (still using a standard 5V single supply for the output). While I don't see anything in the datasheet which would actively preclude this use condition, its not supported by any of the provided examples which all (understandably) use symetrical input side voltage rails when bipolar. 

  • 0
    TI__Mastermind 24112 points

    Hi Roman, 

    Thanks for posting this on e2e! I think it is a fairly common question and not something explicitly said in the datasheet. I will make some content around it! 

    The PGA849 (along with the PGA855, PGA854, and PGA848) can be used with asymmetrical supplies, I would just double check with the boundary diagram calculator, available on the product page: PGA849 data sheet, product information and support | TI.com

    Here is the limitation of the input common mode voltage with those supply voltages. 

    Do you know what the inputs of the DAQ system will be? (voltages and frequency range)

    All the best,
    Carolina