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ISO7240 DC range

Dear Sirs,

Possibly I missed something in the datasheet, but according to the p. 23 of ISO724x it says that it is possible to cover signals from 100kbps to DC.

But actually is not DC, because on same diagram the output logic of this "low-frequency" can just give the output in a digital way (i. e. 0-5V or 0-3.3V). But not in between.

Am I right in this assumption?

There is possible to isolate the whole range of input voltage (maybe bypassing the NOR-FF)?

Some other IC's on hand?

Thank you.

  • Hi,

    An input voltage of 5V/3.3V/0V with Freq=0Hz is still considered a DC input even if it is discrete though it can not be called as Analog or Continuous. Since the isolation barrier is capacitive, it can not directly pass DC (HIGH or LOW) or low data rate bit stream. Hence we pulse width modulate the input signal to be able to transmit across the capacitive isolation barrier. Since these devices are Digital Isolators which are designed to work with digital inputs only, it would not be possible to consider the entire input range.

    We do have Isolated Amplifiers & ADCs that work with Analog Input, please refer to the link below.

    Isolated Amplifier:
    www.ti.com/.../isolated-amplifier-products.page

    Isolated ADCs:
    www.ti.com/.../isolated-adc-products.page

    Best Regards,
    Koteshwar Rao