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ISO224: Galvanically isolating an input signal (0-10V)

Martin Mager
Prodigy 10 points
Part Number: ISO224
Other Parts Discussed in Thread: AMC3330

Hi,

I am trying to build a circuit in which an incoming analog control signal (0-10V), with a precision of 16 bits, is galvanically isolated and then output with the same precision, ideally identical. I was recommended the ISO224 for this purpose, but I am not sure if it is the right component. Ultimately, the circuit should be compact enough to be directly integrated into the control cable, requiring minimal space and additional wiring.

Basically i get a analogous 0-10V signal from a PLC and "only" have to relay the signal after galvanically isolating it from the input side. ideally i would create a small pcb that can be placed in-line with the existing wirering...

Any ideas? 

  • 0
    Guru 276380 points

    The ISO224 has been recommended for this because it is the only device that directly supports the 10 V input voltage. (Its output voltage is 4 V.) But it might be possible to divide the input voltage down to match some other isolator.

    What power supplies do you have available, on either side of the isolation? If you have only one supply, you need to add an isolated DC/DC converter, or use a device with integrated DC/DC like the AMC3330.

  • 0 in reply to Clemens Ladisch
    TI__Expert 5305 points

    Hi Martin,

    I agree with what Clemens has recommended here.

    Additionally, you can view our isolated amplifiers page for comparisons:

    Best regards,

    Eva

  • 0 in reply to Clemens Ladisch
    Prodigy 10 points

    The idea of our engineer is to have it directly in line between sensor and (beckhoff analog out) PLC as space is very limited we would keep it as small as possible... even as small to match the M12 connector. as for the power.. we have unused and isolated 10V and 24V power supplies unoccupied so with some voltage division i can go with 24V down to 10V... thats not the main problem :) 

    Anyway, thanks for your suggestion of using the ISO224 together with the AMC3330... now its up to me to figure out how to assemble everything ;) 

    You cant imagine how a bunch of amateurs (geologists!) handles such things ;) 

    *edit* 

    Thanks EVA, will have a look at it :)

  • 0 in reply to Martin Mager
    TI__Expert 5305 points

    Hi Martin,

    Sounds great! Please let me know if you have any more questions on our devices.

    Best regards,

    Eva

  • 0 in reply to Martin Mager
    Guru 276380 points

    The AMC3330 is an isolated amplifier with integrated DC/DC; you would use it alone. But when you alreay have supplies, you do not need an additional DC/DC; the AMC3330 is not necessary in this application.

    The ISO224 requires a supply between 5 V and 18 V on side 1, and a 5 V supply on side 2. Both supplies use less then 10 mA when idle, so you can probably use simple LDOs.