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ISO224: IMRR

Rolf Heindorf
Prodigy 40 points
Part Number: ISO224


Hi forum,

I cannot find any statement about the IMRR (isolation mode rejection ratio) in the datasheet of the ISO224.

Can anybody help me to find this parameter?

Rolf

  • 0
    TI__Guru**** 182361 points
    Hi Rolf,

    Welcome to our e2e forum! We do not specifically have IMRR data for the ISO224. Some older opto couplers included an IMRR specification where a 60Hz signal was applied to the inputs. We use a square pulse instead and show CMTI in our datasheets. Based on feedback from our designers, IMRR would be at least 140dB at 60Hz.
  • 0 in reply to Tom Hendrick
    Prodigy 40 points

    Hi Tom,

    thank you, 140dB sounds great.

    For me an analog isolation amplifier is mainly used for an isolated measurement of (shunt-) voltages.

    In this respect the IMRR vs. frequency should be of greatest concern.

    I wonder that this parameter is lacking in so many datasheets.

    CMTI is certainly interesting but I find IMRR vs frequency more useful.

    Regards

    Rolf

  • 0 in reply to Rolf Heindorf
    TI__Guru**** 182361 points

    Hi Rolf,

    Thank you for the input!  I'll see if we can get the IMRR data into future datasheets.