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Single ended to Differential signal

user4674678
Intellectual 490 points
Other Parts Discussed in Thread: LMC6482

Hi team,

I want to use an op amp to convert the single ended  signal o the differential signal. Then the differential signal.is connected to ADC.

Q1: Would you send me a  TINA circuit and a document?  

Q2: Do you have the special op amp that can convert the single ended  signal o the differential signal?

  • 0
    TI__Guru**** 164456 points
    User,

    What is the maximum frequency of your input signal and the amount a DC error allowed?
    Is a difference signal really needed? Using ground and 1/2 of the reference voltage should work just as well.
  • 0 in reply to Ron Michallick
    Intellectual 490 points

    Hi Ron,
    My input signal is a DC current signal. Now I use LMC6482 as the TIA. VCC is 3.3V. I want to design a differential input signal as ADC input.
    The output signal of LMC6482 is a single ended signal.
    Q1: Would you send me a TIAN circuit that can convert the differential input signal?

    Q2:What do you mean " Using ground and 1/2 of the reference voltage "?

    Q3: The inverting pin is the input signal. And the non-inverting pin is conncected to 2.048V. Can the  inverting pin be floating?

  • 0 in reply to user4674678
    Guru 140200 points
    Hi User,

    what ADC do you intend to use?

    Kai
  • 0 in reply to kai klaas69
    TI__Guru**** 164456 points

    User,

    If no input current is 0V output at LMC6282 and output voltage rises with input current, then this will work provided that 0V is within the common mode range of the ADC differential input. R C filter is optional. 

    The non inverting (positive) input of the ADC goes to the LMC6482 output and the other input goes to ground. Use the ground near the LMC6482 (in case it is a little different than ground at ADC)