• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 47 subscribers
  • Views 242 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

THS7530: THS7530 LTSpice Simulation

Sojhal Brochal
Prodigy 50 points
Part Number: THS7530
Other Parts Discussed in Thread: TINA-TI, OPA855

Tool/software:

Hi all,

I am interested in using the THS7530 as a programmable gain amplifier for our application.  I am using LTSpice 24.1.4 as I'm more familiar with LTSpice

The simulation circuit is as shown below:

Unfortunately the simulation just hangs including whether or not I skip the DC operating point calculation.

I would appreciate any help on getting this simulation working.

The simulation file is attached belowTHS7530 Simulation.zip


Thanks,


Sojhal

  • 0
    TI__Expert 8680 points

    Hi Sojhal, 

    Our TINA-TI simulator is free to download at this link: https://www.ti.com/tool/TINA-TI

    I would strongly recommend simulating this model with TINA as TINA has a strong convergence engine and we have verified the model functionality using the TINA simulator. 

    Best, 

    Jacob 

  • 0 in reply to Jacob Freet
    Prodigy 50 points

    Hi Jacob, thanks for the advice, I found the issue and it was very stupid, the input is floating and not ground referenced.  The result is slightly different than what TINA-TI gives you, for example in the lowest gain setting on LTSpice I got 8.6 dB, but in TINA-TI I got around 10 dB, whereas the DS specifies the lowest gain as being 11.6 dB.  I can live with those discrepencies however with TINA-TI the circuit simulation file seems to become irreversibly corrupted when I tried to build an analog chain consisting of a TIA (with an OPA855) and this PGA (THS7530).  

    I have documented that issue on another post on E2E:

    e2e.ti.com/.../5671189

    Thanks for your help

    Sojhal 

  • 0 in reply to Sojhal Brochal
    TI__Expert 8680 points

    Understood. Thanks for the update Sojhal. I will support the debug on the other thread. 

    Best, 

    Jacob