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input offset of opa2690

duuk lee
Intellectual 290 points
Other Parts Discussed in Thread: OPA2690

Hello,


I simulated opa2690 in a unit-gain buffer topology, and found its input voltage offset roughly 2.8mV.  Also, due to input bias current of 16uA at in(+), I got 0.8mV at in(+), with feedback node at in(-) is now 3.6mV.  All of them seem to be much higher than specified typ values.  Wonder if this was the same at your side when it was released ? 


Thank you !  

  • 0
    Intellectual 290 points
    Haven't heard anything, I wonder maybe you need more information from my side, and please feel free to let me know if that is the case. Sometimes the simulation bench might be an issue, though hardly be the one in this case as it is a simple unit-gain buffer topology. Any thought ?
  • 0 in reply to duuk lee
    TI__Genius 15975 points

    Hello Duuk,

    The input offset voltage simulates to be close to 2.7mV which is within the limits specified in the datasheet. You have to take the difference between the DC voltage at IN+ and IN- pins to determine the input offset voltage. However, as you have noted, the input bias current of 16uA is higher than what is specified as worst-case for the part. Let me check with the internal team on this.

    Best Regards,

    Rohit