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ISO224: nominal gain specification?

AnBer
Mastermind 30575 points

Part Number: ISO224
Other Parts Discussed in Thread: TINA-TI, AMC1301

Team,

The nominal gain is given at page 8 of SBAS738A:

-Only a "Typ"value is given.Do we have some information on the min/max values?
-How much could this value change between different devices?
-Is there a % of gain deviation between the different ISO224 devices that we can provide?
-Could the TINA-TI/SPICE model help to asses the change in Nominal gain? if yes how?

-The (1) definition seems to be missing. To what note does (1) REFERS TO?

Thanks in advance,

A.

  • 0
    TI__Guru 56732 points

    Hi A,

    Hope you're well this afternoon. 

    The min/max variation of the nominal gain is represented by the gain error spec. I do not believe this is represented in the TINA model. 

    I've sent a message to the systems engineer to confirm, but I think it's refererring to (1) from the previous page: (1) The typical value includes one sigma statistical variation.

  • 0 in reply to Alexander Smith
    TI__Mastermind 30575 points

    Hi Alexander,

    Thanks for the answer.

    -Gain Error (Eg) is given for 25C. It seems that Gig 17 at page 13 gives the Eg vs temperature for ISO224B.
    Do we have it for ISO224A as well?

    Any app notes/documents that would explain on how to calculates/approximate the worst case error/deviation that would be valid for for all the devices?
    Do you think that the TINA-TI model that would help to do some simulation to assess this? Any examples available?

    -Any confirmation from the System engineer?

    Thanks in advance,

    A.

  • 0 in reply to AnBer
    TI__Guru 56732 points

    Hi A,

    We do not have the graph available, but I would expect the slope variation to be about the same.

    I have attached an excel document that was used for the AMC1301 to calculate the worst case error. Just fill in rows 6-16 from the datasheetand it should give you your boundaries. 

    The TINA-TI model can be used to show how changing the external components affects the output measurement. I do not have any examples for this specifically, but if you look at the cookbook circuits under the technical documents tab you will see links within the document to the TINA simulations that were used to generate the graphs. 

    The assumption was correct that it's (1) from the previous page. 

    AMC1301-Q1 Total Error Analysis_VoltageSense.xlsx