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ISO1540: Alternative solution/replacement for Analog devices ADM3260 I2C and power isolator

Part Number: ISO1540
Other Parts Discussed in Thread: LMP7712, , ISO1642, ISO1643, ISO1644, SN6501, UCC12040, UCC12050, ISO1640

Hi Team,

May I ask for help? Our customer have a concern, they were planning to use ADM3260 I2C and power isolator from manufacturer Analog devices in their circuit for isolating both I2C and power on analog site (with LMP7712 and LMP7116 for measuring very low currents) from digital site and prevent possible disruptions on analog site.They are curious if it's there some replacement available (even with multiple ICs) from Texas Instruments for their case?

I am checking ISO1540 as a possible replacement but was not sure of it or is there other IC that should work together with it. I hope you can help us. Thank you so much.

Kind regards,

  • Hi Gerald,

    Thank you for posting to E2E! We are glad to help. ISO160 is our newest isolated-I2C device, and it can be used to isolate the I2C signals, SDA and SCL, of our customer's circuit instead of ISO154x. For different isolation rating requirements, a 5kVrms-reinforced isolation version of the device is available in 16-pin "DW" package (with optional GPIO isolation channels in ISO1642, ISO1643, and ISO1644 devices), and a 3kVrms-basic isolation version is available in a compact 8-pin "D" package.

    To power both sides of the isolated I2C device, SN6501 and SN6505 can be used to generate isolated push-pull power supplies as shown in Figure 3 of this app brief (SLLA417b, copied below), or one of TI's integrated isolated DC/DC power modules like UCC12040 or UCC12050 can be used instead depending on the isolated power level requirement.

    In summary, possible solutions to replace ADM3260 we have available are ISO1640 + SN650x or ISO1640 + UCC120x0 depending on power requirement and other design constraints. Please let us know if you or our customer have any follow up questions.

    Manuel Chavez

  • Hi Manuel.

    Thank you for very informative response. We will let you know if we have further clarifications or concerns.

    Kind regards,