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OPA694: Overload recovery

Part Number: OPA694
Other Parts Discussed in Thread: OPA695, , OPA698, TINA-TI


It was about the recovery time in the case of Gain = 2.5.
So, similar device OPA694 has the data of Gain = 2 (fig.23).
I think that recovery time is less than 10ns. and will satisfy our customer even as the typical spec..
Q1.  Is this data also applicable to OPA695 or should it be replaced to OPA694?
        I simulated clamp AMP (OPA698), but this is narrow  BW.
Q2.  I tested the OPA694 with Tina-TI, but it is possible for the output to exceed the supply voltage.
        It looks like an ideal OPAMP. Is there a problem with the model?
Best regareds,

  • Hi Hiroshi,

    It is again hard to tell if the specs for OPA694 will apply to OPA695. You would need to actually test it to confirm. I believe that they should be similar in results but a test would have to be done to confirm. 

    If you look at the model macro for the OPA694 it mentions the following:

    * 1- This macromodel predicts well: DC, small-signal AC,
    * noise, and transient performance under a wide range
    * of conditions
    * 2- This macromodel does not predict well: distortion
    * (harmonic, intermod, diff. gain & phase, ...),
    * temperature effects, board parasitics, differences
    * between package styles, and process changes
    * 3- For Spice3F4 users they might need to un-comment the lines for the F
    * function and comment out the Lines for PSpice F functions
    * and subckts. First try the present netlist then comment out lines if
    * errors appear.
    * General form:
    * FXXXXXXX N+ N- <POLY(ND)> VN1 <VN2 ...> P0 <P1 ...> <IC=...>
    * Examples:
    * F1 12 10 VCC 1MA 1.3M
    * 4- For some simulators the subckt for the F statement need to be placed
    * inside the ends statement followed by carriage return

    But you mentioned you are modeling with TINA so there shouldn't be any problems. I tested the OPA694 myself in a gain of 1 and I didn't notice any problems. Can you provide me your TINA file? Did you download the model from the tools and software section of the product folder? This will make sure you have the newest model.



  • Hi karan,

    I understand about actual specs.

    I downloaded the latest model from the product folder. This model worked fine.

    Thank you.