LTM2881 and LTM2882 in Space Applications

Hi,

We are considering using the LTM2881 and LTM2882 in a space application for RS-232 and RS-422 communications.

Does this sound like a good idea?

Do you have any radiation or vacuum concerns about this chip?

Does it have any space heritage that you know about?

Do you have any other recommendations?

Thanks,

Ryan

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  • +1
    •  Analog Employees 
    on Mar 19, 2020 11:58 AM

    Hi Ryan,

    Unfortunately these products are not on our space qualified parts list. For isolation I would suggest ADuM7442S or ADuM141ES, both of which are quad channel isolators that are already space qualified.

    We have a complete list of space qualified products on analog.com.

    Regards,

    Conal

  • Thanks for the fast reply, Conal!

    Follow up question - If we used those space qualified chips for isolation between the UART and transceiver, would we then use a non-space qualified transceiver to convert to the 422/232 protocols? If so, do you have any recommendations?

  • 0
    •  Analog Employees 
    on Mar 24, 2020 5:23 PM in reply to rduffy1

    Sorry - I missed your follow-up question. I think it depends on the nature of your application, typically space-qualified parts will be radiation-tolerant or radiation-hardened; but there will be specific requirements to be fulfilled depending on system design (redundancy, retransmission, error handling/correction) and the operating environment (e.g. temperature range). Usually a general purpose part won't be suitable.

    For our standard RS-485 products, newer options typically are more robust simply to industrial-type environments (so IEC 61000-4-2 ESD, IEC 61000-4-4 EFT, even IEC 61000-4-5 surge). Examples with ESD/EFT built in would be ADM3065E as general purpose, or ADM3095E with Level 4 Surge as well as fault protection (miswire of supply to data bus). These are at least available as "EP" enhanced product models with -55C to +125C operation and robust package materials, but no other specific capabilities for Space applications.

    Most RS-232 models are to support specific legacy pinouts and feature sets. LTC2801-LTC2804 offer an extended 1.8V-5.5V supply flexibility, and ADM3232E would be an alternative part with more ESD robustness than legacy parts. LTC2873 is the most recent solution for multi-protocol RS-485/RS-232; this may be of interest in the general case and is -40C to +125C (the RS-232 are -40 to +85C), but again it's not got any specific capabilities for Space applications.

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  • 0
    •  Analog Employees 
    on Mar 24, 2020 5:23 PM in reply to rduffy1

    Sorry - I missed your follow-up question. I think it depends on the nature of your application, typically space-qualified parts will be radiation-tolerant or radiation-hardened; but there will be specific requirements to be fulfilled depending on system design (redundancy, retransmission, error handling/correction) and the operating environment (e.g. temperature range). Usually a general purpose part won't be suitable.

    For our standard RS-485 products, newer options typically are more robust simply to industrial-type environments (so IEC 61000-4-2 ESD, IEC 61000-4-4 EFT, even IEC 61000-4-5 surge). Examples with ESD/EFT built in would be ADM3065E as general purpose, or ADM3095E with Level 4 Surge as well as fault protection (miswire of supply to data bus). These are at least available as "EP" enhanced product models with -55C to +125C operation and robust package materials, but no other specific capabilities for Space applications.

    Most RS-232 models are to support specific legacy pinouts and feature sets. LTC2801-LTC2804 offer an extended 1.8V-5.5V supply flexibility, and ADM3232E would be an alternative part with more ESD robustness than legacy parts. LTC2873 is the most recent solution for multi-protocol RS-485/RS-232; this may be of interest in the general case and is -40C to +125C (the RS-232 are -40 to +85C), but again it's not got any specific capabilities for Space applications.

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