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OPA2677 TINA-TI model is missing pins 5, 6 and 7

Chris Gardner
Prodigy 10 points
Other Parts Discussed in Thread: TINA-TI, OPA2677

I'm attempting to simulate a differential line driver circuit using the OPA2677.  The TINA-TI model for this part, when instantiated within TINA-TI, is missing pins 5, 6, and 7.  This is the non-inverting input, inverting input and output for the second op-amp in the IC.  The model appears to have an inverting input, a non-inverting input, positive and negative power supplies, a single output and a disable signal.  Is there another, more accurate model of this amplifier and if not, what is the intended use for the model, given that not all pins are present.

Thank you,

Chris Gardner

  • 0
    TI__Guru* 93105 points

    Hi Chris,

    The OPA2677 is actually an operational amplifier product from TI's High-Speed Amplifier group, but I can provide a general comment about simulation models for dual, or quad, devices.

    When we build simulation models for amplifiers and comparators that have more than one section such as a dual, or a quad, it is most common to built them as a single device. The other sections are not included within the model. That is why you are not finding model pins for the OPA2677 section B amplifier. Keeping the models limited to singles helps us better maintain models. If a model change is required it eliminates the risk of missing incorporating the change in the other amplifier sections.

    The electrical performances from a modeling standpoint will be identical for the other sections in the dual, or quad, to that of the single. The intention is if you are using a dual, or a quad, in your circuit is that you will use 2, or 4, of the individual models, respectively. Parameters like operating current are based on a single section so that if you use 2 of the models the total current will be equal to that of a dual device. In the real circuit you won't have two sets of V+ and V- for the dual or quad, but that should be evident from the data sheet, or when you do the PC board layout.

    If you have additonal questions about the OPA2677 simulation model, you may want to access the E2E High-Speed Amplifiers forum. They should be able to assist you.

    Regards, Thomas

    PA - Linear Applications Engineering