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    SPI digital isolator adum41521 idle current consuption and replcement

    Because I need to measure the potential of the AC 230, i need isolator for SPI bus (total 7 I/O)
    My first choice is adum4152 or adum3152
    If I understand well have this IC idle current consumption 4.3 mA + 6.1ma for side one and two.
    10ma for 7/24 is not good
    is that so?
    Iis there any substitute with less idle consumption or lower price?

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    Re: SPI digital isolator adum41521 idle current consuption and replcement

    Hi,

    is that so?
    Do you expect someone to contradict the datasheet?

    Iis there any substitute with less idle consumption or lower price?
    I'd do a search for "digital isolator datasheet" then find out current consumption, then price.

    Klaus
    Please don´t contact me via PM, because there is no time to respond to them. No friend requests. Thank you.



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  3. #3
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    Re: SPI digital isolator adum41521 idle current consuption and replcement

    Unfortunately, in the datasheet you would seek this information in vain.
    In dataseet is in table 5. is information only for 1MHz and 17MHz comunications speed , maybe Figure 9. and 12. but this is only typical value and value must be estimated from chart. Analog idle consumption did not publish in datasheet.

    In the SPIsolator family of parts, the idle state of the inputs does not change the power consumption. They are an edge-encoded differential architecture. Idling at low or high, its the same either way. That means idle consumption will not be much lower than consumption at 1MHz
    My guess +3,3V/+3,3V and 25C
    Idd1 2,9-3,0mA
    Idd2 4,9-5,0mA



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