PGA204: PSpice model

Stefan Chindea

Prodigy 40 points

Part Number: PGA204

Does anyone have an OrCAD PSpice model for the PGA204 amplifier or knows where I could download one from?

over 4 years ago

0 Luis Chioye over 4 years ago

TI__Mastermind 49375 points

Hi Stefan,

Unfortunately, the PGA204/5 is a device that was developed in 1993, and no SPICE model was developed for the device; and currently there is no SPICE model available.

Thank you and Regards,

Luis

0 Stefan Chindea over 4 years ago in reply to Luis Chioye

Prodigy 40 points

Thank you for the response Luis.

I was hoping that maybe someone smarter than me modelled it themselves. I understand that no official SPICE model exists, but I was hoping that maybe a community member had a need for a model of this over the many years it has been around and there is an unofficial solution somewhere.

Kind regards,

Stefan

0 kai klaas69 over 4 years ago in reply to Stefan Chindea

Guru 140200 points

Hi Stefan,

you could emulate the PGA with three discrete OPAmps.

Kai

0 Stefan Chindea over 4 years ago in reply to kai klaas69

Prodigy 40 points

Hello Kai,

Thank you for your suggestion. I am considering replicating the schematic of the "insides" on the pga204 datasheet. Is there a suggestion of a component that has a PSpice model to use as A1 A2 A3?

Kind regards,

Stefan

0 Luis Chioye over 4 years ago in reply to Stefan Chindea

TI__Mastermind 49375 points

HI Stefan,

As Kai has suggested, a rough or approximate model using some of the datasheet parameters can be created using three op-amps as shown in the block diagram and matching the frequency response from the datasheet parameters.

Attached is an TINA SPICE OPA block that allows you to edit parameters: offset, first dominant pole and max supply range, etc. in case you would like to work this on your own. Using the datasheet parameters, you can create a model that roughly matches the frequency response, offset and other basic parameters.

I could look at giving you a rough model for offset and frequency response based on the datasheet; but it will be an approximation. If you are interested in this, I would expect I could provide this to you in a couple of business days.

Thank you and Regards,

Luis

OPAx_model(1).TSC

0 Stefan Chindea over 4 years ago in reply to Luis Chioye

Prodigy 40 points

Hi Luis,

Thank you for the model and the recommendation. I will have a look at how to use TINA and have an attempt at making my own "model emulation" based on the datasheet.

Thank you once again both to you and to Kai.

Kind regards,

Stefan

0 kai klaas69 over 4 years ago in reply to Stefan Chindea

Guru 140200 points

You are welcome, Stefan!

Kai

0 Luis Chioye over 4 years ago in reply to kai klaas69

TI__Mastermind 49375 points

HI Stefan,

Thank you, let me know if you need help.

Kind Regards,

Luis

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PGA204: PSpice model