INA, INA Datasheet, INA MicroPower Instrumentation Amplifier Datasheet, buy INA The INA and INA are precision instrumentation ampli- fiers for semiconductor products and disclaimers thereto appears at the end of this data sheet. INAU ti INA, Micropower Instrumentation Amplifier Single And Dual Versions. DESCRIPTION. Details, datasheet, quote on part number: INAU .
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Message 16 of Easiest thing to do in this case will be to take the original file, and add.
I also tried changing the symbol to model pins but that also didn’t work, it just made it worst. Using an Op-amp and Using a voltage divider. I’ve tested with the first circuit and I found the output of ina varying with thermocouple temperature.
how to import INA spice model into multisim – Page 2 – Discussion Forums – National Instruments
Message 20 of Message 19 of So I tried to add an offset to the thermocouple input. If you swap the wires on pins 1 and 5, you’ll probably get the simulation results you expect, but then of course the wiring is wrong.
This question does not appear to be about programming within the scope defined in the help center. I’ve done that in two ways: I’m tryng to use this component as you created, but is not simulating, the gain is not changing. I guess that because I wanted to isolate the problem I designed the most simple circuit as possible datsaheet forgot to pay attention to dagasheet few details like having the reference pin connected to a midway voltage between the power rails.
Most Active Software Boards: So the first circuit is more accurate. Since it will dafasheet the first thing in the listing, Multisim will see an 8 pin subcircuit, which just uses the 8-pin INAP defined below which in turn uses the other two op-amp subcircuits.
With the pins defined like that you can just use the comment at the bottom of the file just above the nested INAP subcircuit to figure out which pin maps to which model node since the wrapper defined the pins exactly the same.
The main point is to have the subcircuit that you want the component to use directly as the top. There’s an INA model in the database that you may want to try that has these pins modeled, however, it’s not supplied by TI directly, so you’ll have to take the results with a grain of salt. This will make the first subcircuit in the text a subcircuit named INAP, ending with the “extra”.
Message 11 of As the thermocouple produces a very low voltage, I use an INAP instrumentation amplifier to amplify the voltage. I’ve done that in two ways:.
If you have any questions, let us know! Message 14 of ENDS in the original file almost suggests that it could have been wrapped already, and that a. Message 15 of Once again thank you. I tried your suggestions and it didn’t work. It looks like the 3rd.
The divider one is better from an error standpoint because the offset voltage from the divider is common mode input to the dtasheet, so it will be cancelled. Now everything is working well and I can carry on with my simulations.
But, is the second one correct? I’m sending a screen dump with the pin names so that you can see what I get when I show them. I believe it has better offset specs, which is the most important spec in a thermocouple amplifier. So, here’s the trick in this case: And the 1K’s could probably be 10K, if you want to save some current. Beware that the output voltage will not go rail daatsheet rail also.
If you show the pin names on the schematic in datasheett Display tab of the component properties you’ll be able to see the differences. I would suggest that the easiest way to get the pin setup as expected is to create the component using the INA in the master database as the starting symbol since it has the pin names and numbers matching the INA data sheet, dataeheet with a different model. May I know if my circuits are correct? By the way, if it helps at all, I’m comparing by doing a parameter sweep over the resistor value using the values mentioned above.
It looks like the model is actually okay now. Then you’ll be able to wire datawheet up exactly as you expect to be able to, and the behaviour should be what you expect.
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I’m attaching the model file I’ve used with the suggested changes. But the errors from the two op-amps and the associated resistors will be random, and will not be cancelled. I think the first circuit is ok. So tomorrow I’ll get it reinstalled and try your suggestions again and I’ll get back to you. If this question can be reworded to fit the rules in the help centerplease edit the question. You can get better parts than the INA part.
Message 17 of But in its datasheet it says the input common mode voltage is 1. The text file as provided isn’t really in the format that Multisim can work with it properly. Could you give me some help tryng to Make this model work?