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Tool/software: TINA-TI or Spice Models
Hello,
I am using the THS4521 to drive the ADC ADS1278. I need a gain of 5 in order to cover the complete range of the ADC. In the datasheets there is the following example with gain 1.
I am trying to simulate the same circuit but replacing the feedback resistor with 5k. From now I will call the feedback resistor RF.
Using RF=3k, I get the following result:
It looks like VOUTM is clipping, but it is not even close to the rail. The common mode, the output and the input voltages are all within the operation ranges, and I still get this unexpected result. Could you confirm if this is a problem of the model, or if there is some other phenomenon I am not understanding?
I am attaching my TINA and Allegro files.
Thank you a lot for your help.
2009_THS4521_driver_circuit_for_ADC_ADS1278.TSC
Hi Alexandra,
Just want to give you an update... I did confirm the issue with the model for single supply (VCC,0V) application. Thanks for pointing this one out.
I am still working on possible solutions to this.. meanwhile if 2009 model is good for you, then I would encourage you to use that for your simulation.
Herman
Thanks Herman for the update.
I will use 2009 model then, that works for me. I just wanted to make sure the problem was not in my design.
Alexandra.