THS7530: THS7530 LTSpice Simulation

Sojhal Brochal

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

21 days ago

0 Jacob Freet 18 days ago

TI__Expert 8540 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 Sojhal Brochal 18 days ago 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 Jacob Freet 17 days ago in reply to Sojhal Brochal

TI__Expert 8540 points

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

Best,

Jacob

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THS7530: THS7530 LTSpice Simulation