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RES60A-Q1: RES60A-Q1 Matching Performance

Conor
Guru 12165 points
Part Number: RES60A-Q1
Other Parts Discussed in Thread: RES11A, RES11A-Q1

Tool/software:

Hi,

We are currently evaluating the use of two RES60A-Q1 devices for high-voltage differential current sensing. In this configuration, we would like to confirm whether the device-to-device matching—specifically gain and offset variations—is suitable for accurate differential measurements. Could you please provide any relevant data or application guidance regarding the expected matching performance when using two discrete RES60A-Q1 devices?

Additionally, we are interested in future products similar to the RES11A that support dual-pair configurations and are rated for up to ±1400 V, as shown in the attached image. If such a product is planned, could you kindly share the expected sample availability and RTM (Release to Market) timeline?

Best regards,

Conor

  • 0
    TI__Intellectual 2670 points

    Hi Conor, 

    I'd be happy to help with an error analysis!

    However, it looks like the image you attached did not upload properly, could you try uploading it again? Also, just to make sure I understand your question, when you say "high-voltage differential current sensing" are you referring to a discrete difference amplifier used as a current shunt monitor, similar to what we have shown in the RES11A-Q1 datasheet below (with the addition of a shunt resistor between VIN+ and VIN-), or a different topology?

    Kind Regards,

    Alex Curtis

  • 0 in reply to Alex Curtis
    Guru 12165 points

    Hi Alex,

    I was just about to attach the image you sent！ I am checking because the RES11A does not support high voltage.

    Thanks,

    Conor

  • 0 in reply to Conor
    TI__Intellectual 2670 points

    Hey Conor,

    Thanks for your patience. See my attached calculations for a full derivation of the CMRR of a difference amplifier using two RES60A-Q1. 

    Please let me know if you have any questions Slight smile

    Best Regards,

    Alex Curtis

    res60DifferenceAmpError.pdf