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TL441-EP: Perform an impedance measurement

Stefano Casilli
Prodigy 40 points
Part Number: TL441-EP

Hi,

i need to perform an impedance measurement and i think about using the TL441-EP. I used the configuration suggested in the application information in data-sheet, but what are A2 and B2 and why i need to input the signals both in A1 and in A2 and in B1 and B2 being the two in A2 and B2 amplified by the two op-amp? How much is the gain i have to set for the op amp in A2 and B2?

Thanks for the reply

Stefano

  • 0
    TI__Genius 17085 points
    Hello Stefano,
    The gain of each stage is 30 dB.
    A1 and A2 are the differential inputs to one half of the circuit and B1 and B2 to the other. How you use A2 and B2 would depend upon how you plan to configure the part and how much gain you need. If the do not need more than 50 dB gain, then the part could be used like a dual channel op amp, because you do not need the gain for the first stage. Please see the different application diagrams in the datasheet.

    If you have any other questions, please let me know. If you do, please let us know the exact part number and grade of interest. For instance, do you need the commercial grade, mil grade or EP grade?