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AM26LV32: Isolated device which similar as AM26LV32

Zhizhao Niu
Intellectual 2315 points
Part Number: AM26LV32
Other Parts Discussed in Thread: AM26LV31, ISO1452, ISO1450, ISO7760

Hi team, 

We are currently using single-ended differential level conversion chips AM26LV32 and AM26LV31. Is there an isolated type? The requirement is that the delay cannot exceed 22ns

Thanks.

Zhizhao

  • 0
    TI__Mastermind 48215 points

    Hi Zhizhao,

    All of our isolated RS422/485 transceivers are single channel, so we would need to recommend a multi-chip solution here. The devices with the lowest propagation delay are ISO1450 and ISO1452 which have typical values of 19ns and max values of 41ns. 

    It would also be possible to use a digital isolator in conjunction with AM26LV32 and AM26LV31 to achieve a two-chip (per board) solution. A device such as ISO7760 would allow for all digital lines to be isolated to/from the transceiver. Without the integrated transceiver, the delay values are lower at around 16ns maximum. 

    Let me know if you have questions about any of these devices or there are other requirements for this design. 

    Regards,
    Eric Schott

  • 0 in reply to Eric Schott1
    TI__Intellectual 2315 points

    Thanks Eric!

    I have one question about solution of AM26LV32 and AM26LV31 in conjunction with ISO7760,  from datasheet I sum this two device propagation delay and got typical value with 20ns and maximum with 36ns. Am I understand correct with sum two maximum value when use conjunction solution ? So far we just concern with driver side(from differential to single-end)

    Keep in touch. Thank you.

    Zhizhao

  • 0 in reply to Zhizhao Niu
    TI__Mastermind 48215 points

    Hi Zhizhao,

    Yes, the total propagation delays of the isolator and transceiver will be additive. Based on existing RS485 transceivers and digital isolators, it will be difficult to reduce the maximum delay below 22ns. Is this requirement coming from an OEM or from calculated requirements of the system? If it is from an OEM, I would recommend inquiring to the source of the requirement so that the tradeoffs necessary to meet it might be reevaluated. 

    Regards,
    Eric Schott