ADA4861 Spice Model

Hello,

I downloaded the spice model for the AD4861 and i found that it does not simulate properly without a -5V yet the datasheet clearly states that it can operate from a single supply at +5V.  Is this a known issue with the spice model?  Is there an updated model that does not have this issue?

If needed i can send you my simulation file.  i am using simetrix and i imported the model using the automated tool that does not have any issue with the model and works correctly at +/-5V. 

Thanks,

  • 0
    •  Analog Employees 
    on Apr 9, 2014 11:51 PM over 7 years ago

    Hi Rene,

    We are looking into this. In the meantime, it would be helpful if you could attach your simulation file here.

    Best regards,

    Emman

  • 0
    •  Analog Employees 
    on Apr 10, 2014 4:42 PM over 7 years ago

    Hi Emman,

    Please find the attached simulation model.  This was done with Simetrix. It's just a simple LPF and when the SD and the Vs pins are grounded as per the datasheet the model doesn't seem to function correctly. 

    I suspect it's something about the SD pin but i'm not certain.  

  • 0
    •  Analog Employees 
    on Apr 10, 2014 9:24 PM over 7 years ago

    Hi harryh,

      I've added the bypass cap and reduced the voltage divider resistances to 1k rather than 100k to give a 2.5V bias on the + node of the ADA4861. 

    I'm quite confident with the rest of the circuitry because as soon as I add a -5V rail to the Vs connection and the SD connection the model works as expected. 

    When i place a -5V connection on the SD pin and ground the Vs pin the model works correctly.  The datasheet says that when not using the SD function to ground the pin to the same potential as Vs.  When i do this the model does not seem to work as i would expect.