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ISO122: ISO122/ISO124 or AMC0211S

Geoffrey Child
Prodigy 30 points

Part Number: ISO122
Other Parts Discussed in Thread: ISO124, AMC0211S, AMC1411, ISO224, AMC1400, AMC3330

In a noisy industrial application i have a 4-20 ma and a -10 to +10 signal coming from sensors. I need to get these signals in a microproccesor and want to isolate these signals from the microprocesor. I found the ISO122/ISO124 and they look like they would work easily but was wondering as they are 30 year old technology if i would be better off going with something newer for better temperature and stability performance and also future availability of parts. I couldnt find anything that would handle the +/- 10 volt directly but wondered if i could scale and level shift with a OP amp to get a 0 to 2 volt signal and feed that into something like a AMC0211S. What advice would you give. I dont know the temperature range right now but i have a email into my customer now waiting for a answer but i know its not going to be room temperature and will vary.

  • +1
    TI__Guru 60242 points

    Hi Geoffrey, 

    I would suggest by starting with evaluating the isolation requirements of the application. This would determine the creepage and clearance requirement as well as isolation voltage which would help us begin selection with the correct family of products. 

    If highest isolation requirement is needed, then consider AMC1400 or AMC1411. For reinforced application, I would suggest ISO224 (+/-12Vin) or AMC3330 (with integrated DC/DC!). 

    This e-book has many cookbook application circuits that can assist with analog design for signals into and out of the isolated converter. 

    https://www.ti.com/lit/eb/slyy234/slyy234.pdf

  • 0 in reply to Alexander Smith
    Prodigy 30 points

    Thank you. The ISO224 will be a perfect fit and i dont need to do any level shifting at all