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Grounding the negative terminal on the ISO122

Jamaal_Charles
Genius 3245 points
Other Parts Discussed in Thread: ISO122, AMC1200

Hello,

I am hoping to use the ISO122, but I'd like to tie the negative rail to ground so that I don't have to add a new supply.  Is this ok?  I also would need to what the saturation point is if the signal is close to that rail.  I'd like to isolate a signal that goes from 0 to 5V, and I need it to be accurate from about 1V to 5V.  If you have a different part recommendation, that is fine too.

Thanks!

  • 0
    Guru 21975 points

    Eric,

    The ISO122 is not well suited to operation from a single power supply. A single supply would need to be 9V or greater--let's say 10V. The ground terminal would need to be connected to a pseudo-ground at 5V. Typical output swing would be from 2.5V to 7.5V, centered around the 5V pseudo ground. Not really what you want.

    A better solution may be the AMC1200. It is able to handle small bipolar signals on a single power supply. You could possibly use a voltage divider to reduce your input voltage to this device. Its output is designed to drive a differential input data converter. We on this forum are not experts on this device. If you have further question on this device we will have an expert from the supporting product group jump in.

    Regards, Bruce.