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Fully differential amplifier with single supply but differential input

Lennart Gardian
Prodigy 110 points
Other Parts Discussed in Thread: OPA1632

Hi there,


I just tumbled over a bunch of application note, which where really helpfull but didn't really answered my question. Here it comes:
I have an audio codec which outputs a differential analog signal with an offset of 2.5V so that the signal is between 0.875V and 4.125V on both outputs. Now I'd like to use a differential amplifier as a line driver. By using standard OPAs I wouldn't need any negative voltage supply. How about differential amplifiers? Is there a way or is this a waste of time to think about? The application note "Differential Op Amp Single-Supply Design Techniques" explains how to use a FDA with only one supply but with a single ended input. I guess this doesn't work with a differential input?

Thanks for your help!

Regards,

Lennart

  • 0
    TI__Guru**** 189399 points
    Hi, Lennart,

    As long as the input common-mode range of the op amp is within your audio codec's common mode output voltage, and you have enough signal swing, you should be fine.

    Check out the data sheet for the OPA1632 for more information.

    -d2
  • 0 in reply to Don Dapkus
    Prodigy 110 points
    Hi Don,

    thanks for your help. Would I have to connect both V+ and V- to 5V or as I am used to it from regular OPA to V+=5V and V-=GND?

    Regards,

    Lennart