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LM7321: Single vs dual operation differences, if any

Viktorija Cecil
Mastermind 18261 points
Part Number: LM7321
Other Parts Discussed in Thread: LM7322, OPA4991, OPA2991, OPA991

Is the operation identical of a single vs dual chip (LM7321 vs LM7322 for example), or does having the second opamp/comparator in the IC affect the parameters?

Thanks

Viktorija

  • 0
    TI__Mastermind 24490 points

    Hi Viktorija,

    Usually if there's an expected performance difference between the channels, we will mention it in the datasheet. An example of this is the OPA4991 compared to the OPA991 and OPA2991. There's a slight difference between their max Vos specs. 

    That's also why we spec with a typical as these units do have a natural variation in their performances. See below with the TLV900x family's Vos distribution histogram. 

    Is their a particular concern the customer has with the LM7321 and LM7322? 

    Best Regards, 

    Robert Clifton 

  • 0 in reply to Robert Clifton56
    TI__Mastermind 18261 points

    Hi Robert, thanks for a quick reply. Here are additional details:

    The primary concern is the slew rate and output drive capability, where those seem to have been the most challenging/limiting factor in part selection (spice simulation) so far and I only have a spice model for the dual part (LM7322). Since there are no noted differences in the datasheet besides input power, that is likely my answer.

    I am however confused that there seems to be a single op-amp version of the LM7322 (LM7322MA) in a SOIC (Package Drawing D). I thought the LM7322 was the dual version and the LM7321 was the single opamp version. I guess I was expecting all the LM7322 parts listed below to use Package Drawing DGK.

    https://www.ti.com/lit/ds/symlink/lm7322.pdf

  • +1 in reply to Viktorija Cecil
    TI__Mastermind 24490 points

    Hi Viktorija,

    We usually only design one simulation model for a device family since they all perform similar and only the channels vary. 

    Viktorija Cecil said:
    I am however confused that there seems to be a single op-amp version of the LM7322 (LM7322MA) in a SOIC (Package Drawing D). I thought the LM7322 was the dual version and the LM7321 was the single opamp version. I guess I was expecting all the LM7322 parts listed below to use Package Drawing DGK.

    So there's two things going on here. First both LM7322 and LM7321 come in SOIC packages. Their pinouts vary greatly in this package as you can see in the pictures.

    Second, I can see where the confusion is coming from since the 8 pin VSSOP or SOIC says DGK package, when it should have been more specific that DGK is for VSSOP and D is for SOIC. A small mistake in the datasheet but one that I'll make note of so we can fix. 

    Does that clarify things? 

    Best Regards, 

    Robert Clifton 

  • 0 in reply to Viktorija Cecil
    TI__Mastermind 24490 points

    Hi Viktorija,

    Glad I could help! 

    Best Regards,

    Robert Clifton