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OPA2320: TINA question for OPA2320

Mickey Zhang75
Prodigy 60 points
Part Number: OPA2320
Other Parts Discussed in Thread: OPA2330

Hi team,

I have designed a OPA2330 circuit in the attach. When I simulate it as below

Q1: I set the reference is 2.048V,  Why does it display 2.05V? How to change it to display to 2.048V?

OPA320 T1_T0.TSC

Q2: You may see the waveform. I change the ticks,the Y-axis always display 2.05V. t. Would you help me to change the Y-axis more accurately?

  • 0
    TI__Intellectual 795 points

    Hi Mickey, 

    Q1: I set the reference is 2.048V,  Why does it display 2.05V? How to change it to display to 2.048V?

    To adjust the number of significant figures, please select Analysis/Options, and set the numeric precision to 6. This will show the full 2.048V to be displayed as your reference voltage. 

    Q2: You may see the waveform. I change the ticks,the Y-axis always display 2.05V. t. Would you help me to change the Y-axis more accurately?

    Double-clicking the Y axis of your lower transient plot (VF1), set the precision to 6, ticks to 5 (if you want to see numerical values on the Y axis in smaller increments), and manually adjust the upper and lower y limit value. This should adjust your axis to a desired level of precision.  

    Please let me know if you have any further questions. 

     
    Best regards,
    Vladimir

  • 0
    TI__Prodigy 715 points

    Hi Mickey,

    That's a great question Mickey.  I wasn't able to find a way to change the number of significant digits directly in the x/y box.  I was able to increase the resolution of the y-axis itself by increasing the number of “ticks”, though if that’s helpful.  

    One thought is create a math function in the post-processor like so ScaledUp = (VF1(t)-2.048)*1000. Just keep in mind that the error function shows in mV but it’s actually uV.  That makes the limitations of that x/y box 1000 times less of an issue.  

    Thanks,
    Scott

  • 0 in reply to Vladimir Ilic
    Prodigy 60 points

    Hi Vladimir,

    For my Q2, you mean precision should be higher than Ticks?

    Mickey

  • 0 in reply to scottgulas
    Prodigy 60 points

    Sorry, Scott, I cannot understand what your meaning is. Would you explain more detailed?

  • 0 in reply to Mickey Zhang75
    TI__Intellectual 795 points

    Hi Mickey, 

    'Precision' and 'Ticks' settings are independent. Precision defines the number of decimals in the Y axis value; you'll want a minimum of 3 given the desired displayed value of 2.048. Ticks determines how many numbers you'll have displayed along the Y axis - the more ticks the smaller the interval between two values shown. You can adjust the number of ticks to your personal preference. 

    - Example: precision=5, ticks=2

    - Example: precision = 5, ticks = 5

    I hope this clarifies, please let me know if you have any further questions. 

    Regards,
    Vladimir