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OPA320: Unable to get single ended output from the differential output from AMC1311

Sharat Yadav
Expert 1015 points
Part Number: OPA320
Other Parts Discussed in Thread: AMC1311,

What is the Role of this 1V65 REF connected between R31 and C22. 

I have connected the same circuit but I am not able to get the output

  • 0
    Guru 140200 points
    Hi Sharat,

    hmm, you should have a look again at figure 50 of datasheet of AMC1311. This figure shows how to connect an OPAmp to the output of AMC1311. Can you see the mismatch between your circuit and the circuit shown in figure 50?

    Kai
  • 0
    TI__Guru* 93105 points
    Hello Sharat,

    Your question: What is the Role of this 1V65 REF connected between R31 and C22?

    The 1V65_REF voltage establishes a common-mode voltage, or midscale voltage of 1.65 V on the OPA320 non-inverting input . This voltage level is one-half the 3.3 V supply voltage applied to the OPA320 V+ pin. Setting the common-mode voltage to midscale maximizes the usable input and output voltage ranges of the OPA320.

    Be sure to consider Kai's comment about your OPA320 circuit and that shown in datasheet Fig. 50.

    Regards, Thomas
    Precision Amplifiers Applications Engineering
  • 0 in reply to Thomas Kuehl
    TI__Genius 11135 points
    Sharat

    We have not heard back from you so we will close this thread. Please reply if further discussion is needed.

    Thanks
    Dennis